diff --git a/firmware/application/baseband_api.cpp b/firmware/application/baseband_api.cpp
index 5db5014a..ea819bfb 100644
--- a/firmware/application/baseband_api.cpp
+++ b/firmware/application/baseband_api.cpp
@@ -155,9 +155,11 @@ void set_adsb() {
 	send_message(&message);
 }
 
-void set_jammer(const bool run) {
+void set_jammer(const bool run, const uint32_t type, const uint32_t speed) {
 	const JammerConfigureMessage message {
-		run
+		run, 
+		type,
+		speed
 	};
 	send_message(&message);
 }
diff --git a/firmware/application/baseband_api.hpp b/firmware/application/baseband_api.hpp
index 61db43fc..145e7e76 100644
--- a/firmware/application/baseband_api.hpp
+++ b/firmware/application/baseband_api.hpp
@@ -65,7 +65,7 @@ void set_ook_data(const uint32_t stream_length, const uint32_t samples_per_bit,
 					const uint32_t pause_symbols);
 void set_pocsag(const pocsag::BitRate bitrate);
 void set_adsb();
-void set_jammer(const bool run);
+void set_jammer(const bool run, const uint32_t type, const uint32_t speed);
 void set_rds_data(const uint16_t message_length);
 //void set_dtmf_data(const uint32_t bw, const uint32_t tone_length, const uint32_t pause_length);
 
diff --git a/firmware/application/bitmap.hpp b/firmware/application/bitmap.hpp
index 9d6816cd..bba7d1a9 100644
--- a/firmware/application/bitmap.hpp
+++ b/firmware/application/bitmap.hpp
@@ -29,6 +29,30 @@ namespace ui {
 
 // Use firmware/tools/make_bitmap.py !
 
+static constexpr uint8_t bitmap_previous_data[] = {
+	0x00, 0x00, 
+	0x00, 0x00, 
+	0xE0, 0x03, 
+	0x10, 0x03, 
+	0x88, 0x01, 
+	0xC4, 0x00, 
+	0xE2, 0x3F, 
+	0x01, 0x20, 
+	0x01, 0x20, 
+	0xE3, 0x3F, 
+	0xC6, 0x3F, 
+	0x8C, 0x00, 
+	0x18, 0x01, 
+	0xF0, 0x03, 
+	0xE0, 0x03, 
+	0x00, 0x00, 
+};
+
+static constexpr Bitmap bitmap_previous {
+	{ 16, 16 }, bitmap_previous_data
+};
+
+
 static constexpr uint8_t bitmap_icon_adsb_data[] = {
 	0x80, 0x01, 
 	0xC0, 0x03, 
diff --git a/firmware/application/freqman.cpp b/firmware/application/freqman.cpp
index 1774e193..c23cd065 100644
--- a/firmware/application/freqman.cpp
+++ b/firmware/application/freqman.cpp
@@ -35,9 +35,8 @@ bool load_freqman_file(std::vector<freqman_entry> &frequencies) {
 	
 	while (freqs_file.open("freqman.txt").is_valid()) {
 		auto result = freqs_file.create("freqman.txt");
-		if (result.is_valid()) {
+		if (result.is_valid())
 			return false;
-		}
 	}
 	
 	freqs_file.read(file_buffer, 2048);
diff --git a/firmware/application/freqman.hpp b/firmware/application/freqman.hpp
index 157f9c1e..f8cb4b64 100644
--- a/firmware/application/freqman.hpp
+++ b/firmware/application/freqman.hpp
@@ -31,6 +31,12 @@
 
 using namespace ui;
 
+enum freqman_error {
+	NO_ERROR = 0,
+	ERROR_ACCESS,
+	ERROR_EMPTY
+};
+
 struct freqman_entry {
 	rf::Frequency value;
 	std::string frequency_str;
diff --git a/firmware/application/ui_freqman.cpp b/firmware/application/ui_freqman.cpp
index 67a5888f..ea622c1f 100644
--- a/firmware/application/ui_freqman.cpp
+++ b/firmware/application/ui_freqman.cpp
@@ -36,16 +36,17 @@ void FrequencySaveView::on_save_name(NavigationView& nav) {
 	frequencies.push_back({ value_, "", desc_buffer });
 	nav.pop();
 }
+
 void FrequencySaveView::on_save_timestamp(NavigationView& nav) {
 	frequencies.push_back({ value_, "", str_timestamp });
 	nav.pop();
 }
 
 void FrequencySaveView::focus() {
-	button_save_timestamp.focus();
-	
-	if (error)
-		nav_.display_modal("Error", "File acces error !", ABORT, nullptr);
+	if (error == ERROR_ACCESS)
+		nav_.display_modal("Error", "File acces error", ABORT, nullptr);
+	else
+		button_save_timestamp.focus();
 }
 
 void FrequencySaveView::on_tick_second() {
@@ -69,7 +70,10 @@ FrequencySaveView::FrequencySaveView(
 	File freqs_file;
 	
 	if (!load_freqman_file(frequencies)) {
-		if (!create_freqman_file(freqs_file)) error = true;
+		if (!create_freqman_file(freqs_file)) {
+			error = ERROR_ACCESS;
+			return;
+		}
 	}
 	
 	signal_token_tick_second = rtc_time::signal_tick_second += [this]() {
@@ -119,17 +123,27 @@ void FrequencyLoadView::on_frequency_select() {
 }
 
 void FrequencyLoadView::focus() {
-	menu_view.focus();
-	
-	if (error)
-		nav_.display_modal("Error", "File acces error !", ABORT, nullptr);
+	if (error == ERROR_ACCESS)
+		nav_.display_modal("Error", "File acces error", ABORT, nullptr);
+	else if (error == ERROR_EMPTY)
+		nav_.display_modal("Error", "Frequency DB empty", ABORT, nullptr);
+	else
+		menu_view.focus();
 }
 
 FrequencyLoadView::FrequencyLoadView(
 	NavigationView& nav
 ) : nav_ (nav)
 {
-	error = !load_freqman_file(frequencies);
+	if (!load_freqman_file(frequencies)) {
+		error = ERROR_ACCESS;
+		return;
+	}
+	
+	if (frequencies.size() == 0) {
+		error = ERROR_EMPTY;
+		return;
+	}
 
 	add_children({
 		&menu_view,
@@ -181,10 +195,12 @@ void FreqManView::setup_list() {
 }
 
 void FreqManView::focus() {
-	menu_view.focus();
-	
-	if (error)
-		nav_.display_modal("Error", "File acces error !", ABORT, nullptr);
+	if (error == ERROR_ACCESS)
+		nav_.display_modal("Error", "File acces error", ABORT, nullptr);
+	else if (error == ERROR_EMPTY)
+		nav_.display_modal("Error", "Frequency DB empty", ABORT, nullptr);
+	else
+		menu_view.focus();
 }
 
 FreqManView::~FreqManView() {
@@ -195,7 +211,15 @@ FreqManView::FreqManView(
 	NavigationView& nav
 ) : nav_ (nav)
 {
-	error = !load_freqman_file(frequencies);
+	if (!load_freqman_file(frequencies)) {
+		error = ERROR_ACCESS;
+		return;
+	}
+	
+	if (frequencies.size() == 0) {
+		error = ERROR_EMPTY;
+		return;
+	}
 	
 	add_children({
 		&menu_view,
@@ -231,7 +255,6 @@ FreqManView::FreqManView(
 	button_exit.on_select = [this, &nav](Button&) {
 		nav.pop();
 	};
-
 }
 
 }
diff --git a/firmware/application/ui_freqman.hpp b/firmware/application/ui_freqman.hpp
index a95c495d..e1d5c0f8 100644
--- a/firmware/application/ui_freqman.hpp
+++ b/firmware/application/ui_freqman.hpp
@@ -43,19 +43,19 @@ public:
 
 private:
 	NavigationView& nav_;
-	bool error = false;
+	freqman_error error { NO_ERROR };
 	char desc_buffer[32] = { 0 };
-	rtc::RTC datetime;
-	rf::Frequency value_;
+	rtc::RTC datetime { };
+	rf::Frequency value_ { };
 	std::string str_timestamp { };
 	
 	void on_save_name(NavigationView& nav);
 	void on_save_timestamp(NavigationView& nav);
 	void on_tick_second();
 	
-	std::vector<freqman_entry> frequencies;
+	std::vector<freqman_entry> frequencies { };
 	
-	SignalToken signal_token_tick_second;
+	SignalToken signal_token_tick_second { };
 	
 	BigFrequency big_display {
 		{ 4, 2 * 16, 28 * 8, 32 },
@@ -87,7 +87,7 @@ private:
 
 class FrequencyLoadView : public View {
 public:
-	std::function<void(rf::Frequency)> on_changed;
+	std::function<void(rf::Frequency)> on_changed { };
 	
 	FrequencyLoadView(NavigationView& nav);
 	
@@ -97,14 +97,14 @@ public:
 
 private:
 	NavigationView& nav_;
-	bool error = false;
+	freqman_error error { NO_ERROR };
 	
 	void on_frequency_select();
 	void setup_list();
 	
-	std::vector<freqman_entry> frequencies;
+	std::vector<freqman_entry> frequencies { };
 	
-	MenuView menu_view;
+	MenuView menu_view { };
 	
 	Button button_cancel {
 		{ 72, 264, 96, 32 },
@@ -123,7 +123,8 @@ public:
 
 private:
 	NavigationView& nav_;
-	bool error = false;
+	
+	freqman_error error { NO_ERROR };
 	
 	void on_frequency_select();
 	void on_edit_freq(rf::Frequency f);
@@ -131,7 +132,7 @@ private:
 	void on_delete();
 	void setup_list();
 	
-	std::vector<freqman_entry> frequencies;
+	std::vector<freqman_entry> frequencies { };
 
 	MenuView menu_view { true };
 
diff --git a/firmware/application/ui_jammer.cpp b/firmware/application/ui_jammer.cpp
index 23db90cd..6a7c1177 100644
--- a/firmware/application/ui_jammer.cpp
+++ b/firmware/application/ui_jammer.cpp
@@ -230,7 +230,7 @@ JammerView::JammerView(NavigationView& nav) {
 			button_transmit.set_text("START");
 			transmitter_model.disable();
 			radio::disable();
-			baseband::set_jammer(false);
+			baseband::set_jammer(false, 0, 0);
 			jamming = false;
 		} else {
 			
@@ -297,7 +297,7 @@ JammerView::JammerView(NavigationView& nav) {
 				transmitter_model.set_tx_gain(47);
 				transmitter_model.enable();
 
-				baseband::set_jammer(true);
+				baseband::set_jammer(true, options_type.selected_index(), options_speed.selected_index());
 			} else {
 				nav.display_modal("Error", "Jamming bandwidth too large.");
 			}
diff --git a/firmware/application/ui_navigation.cpp b/firmware/application/ui_navigation.cpp
index 1f157e84..8522017b 100644
--- a/firmware/application/ui_navigation.cpp
+++ b/firmware/application/ui_navigation.cpp
@@ -68,7 +68,14 @@ namespace ui {
 /* SystemStatusView ******************************************************/
 
 SystemStatusView::SystemStatusView() {
+	static constexpr Style style_systemstatus {
+		.font = font::fixed_8x16,
+		.background = Color::dark_grey(),
+		.foreground = Color::white(),
+	};
+	
 	add_children({
+		&backdrop,
 		&button_back,
 		&title,
 		&button_stealth,
@@ -78,6 +85,8 @@ SystemStatusView::SystemStatusView() {
 		&sd_card_status_view,
 	});
 	
+	title.set_style(&style_systemstatus);
+	
 	if (!portapack::persistent_memory::ui_config_textentry())
 		button_textentry.set_bitmap(&bitmap_keyboard);
 	else
@@ -86,7 +95,7 @@ SystemStatusView::SystemStatusView() {
 	if (portapack::persistent_memory::stealth_mode())
 		button_stealth.set_foreground(ui::Color::green());
 
-	button_back.on_select = [this](Button&){
+	button_back.on_select = [this](ImageButton&){
 		if (this->on_back)
 			this->on_back();
 	};
@@ -110,7 +119,7 @@ SystemStatusView::SystemStatusView() {
 }
 
 void SystemStatusView::set_back_enabled(bool new_value) {
-	//button_back.set_text(new_value ? back_text_enabled : back_text_disabled);
+	button_back.set_foreground(new_value ? Color::white() : Color::dark_grey());
 	button_back.set_focusable(new_value);
 }
 
diff --git a/firmware/application/ui_navigation.hpp b/firmware/application/ui_navigation.hpp
index 3aaf1fc8..cc3a8ca9 100644
--- a/firmware/application/ui_navigation.hpp
+++ b/firmware/application/ui_navigation.hpp
@@ -64,12 +64,17 @@ public:
 
 private:
 	static constexpr auto default_title = "PortaPack|Havoc";
-	//static constexpr auto back_text_enabled = " < ";
-	//static constexpr auto back_text_disabled = " * ";
 
-	Button button_back {
+	Rectangle backdrop {
+		{ 0 * 8, 0 * 16, 240, 16 },
+		Color::dark_grey()
+	};
+
+	ImageButton button_back {
 		{ 0 * 8, 0 * 16, 16, 16 },
-		"",		//back_text_disabled,
+		&bitmap_previous,
+		Color::white(),
+		Color::dark_grey()
 	};
 
 	Text title {
@@ -81,28 +86,28 @@ private:
 		{ 152, 0, 2 * 8, 1 * 16 },
 		&bitmap_stealth,
 		Color::light_grey(),
-		Color::black()
+		Color::dark_grey()
 	};
 	
 	ImageButton button_textentry {
 		{ 170, 0, 2 * 8, 1 * 16 },
 		&bitmap_unistroke,
 		Color::white(),
-		Color::black()
+		Color::dark_grey()
 	};
 
 	ImageButton button_camera {
 		{ 188, 0, 2 * 8, 1 * 16 },
 		&bitmap_camera,
 		Color::white(),
-		Color::black()
+		Color::dark_grey()
 	};
 
 	ImageButton button_sleep {
 		{ 206, 0, 2 * 8, 1 * 16 },
 		&bitmap_sleep,
 		Color::white(),
-		Color::black()
+		Color::dark_grey()
 	};
 
 	SDCardStatusView sd_card_status_view {
diff --git a/firmware/application/ui_sd_card_status_view.cpp b/firmware/application/ui_sd_card_status_view.cpp
index 03394803..252b3d27 100644
--- a/firmware/application/ui_sd_card_status_view.cpp
+++ b/firmware/application/ui_sd_card_status_view.cpp
@@ -83,7 +83,7 @@ const Color color_sd_card(const sd_card::Status status) {
 
 SDCardStatusView::SDCardStatusView(
 	const Rect parent_rect
-) : Image { parent_rect, &bitmap_sd_card_unknown, detail::color_sd_card_unknown, Color::black() }
+) : Image { parent_rect, &bitmap_sd_card_unknown, detail::color_sd_card_unknown, Color::dark_grey() }
 {
 }
 
diff --git a/firmware/baseband/proc_jammer.cpp b/firmware/baseband/proc_jammer.cpp
index af0246c1..19cb8eb9 100644
--- a/firmware/baseband/proc_jammer.cpp
+++ b/firmware/baseband/proc_jammer.cpp
@@ -63,25 +63,25 @@ void JammerProcessor::execute(const buffer_c8_t& buffer) {
 		
 		// Phase noise
 		if (r >= 10) {
-			aphase += ((aphase>>4) ^ 0x4573) << 14;
+			aphase += ((aphase >> 4) ^ 0x4573) << 20;
 			r = 0;
 		} else {
 			r++;
 		}
 		
 		aphase += 8830;
-		sample = sine_table_i8[(aphase & 0x03FC0000) >> 18];
+		sample = sine_table_i8[(aphase & 0xFF000000) >> 24];
 		
 		// FM
 		delta = sample * jammer_bw;
 		
 		phase += delta;
-		sphase = phase + (64 << 18);
+		sphase = phase + (64 << 24);
 
-		re = (sine_table_i8[(sphase & 0x03FC0000) >> 18]);
-		im = (sine_table_i8[(phase & 0x03FC0000) >> 18]);
+		re = (sine_table_i8[(sphase & 0xFF000000) >> 24]);
+		im = (sine_table_i8[(phase & 0xFF000000) >> 24]);
 
-		buffer.p[i] = {(int8_t)re, (int8_t)im};
+		buffer.p[i] = {re, im};
 	}
 };
 
@@ -91,6 +91,8 @@ void JammerProcessor::on_message(const Message* const msg) {
 	if (message.id == Message::ID::JammerConfigure) {
 		if (message.run) {
 			jammer_channels = (JammerChannel*)shared_memory.bb_data.data;
+			noise_type = message.type;
+			noise_speed = message.speed;
 			jammer_duration = 0;
 			current_range = 0;
 			
diff --git a/firmware/baseband/proc_jammer.hpp b/firmware/baseband/proc_jammer.hpp
index 33e9032a..8044a0aa 100644
--- a/firmware/baseband/proc_jammer.hpp
+++ b/firmware/baseband/proc_jammer.hpp
@@ -40,6 +40,8 @@ private:
 	
 	JammerChannel * jammer_channels {  };
 	
+	uint32_t noise_type { 0 };
+	uint32_t noise_speed { 0 };
     uint32_t jammer_duration { 0 };
 	int8_t r { 0 }, ir { 0 };
     uint32_t current_range { 0 };
@@ -47,7 +49,7 @@ private:
     uint32_t sample_count { 0 };
 	uint32_t aphase { 0 }, phase { 0 }, delta { 0 }, sphase { 0 };
 	int32_t sample { 0 }, jammer_bw { 0 };
-	int8_t re, im;
+	int8_t re { 0 }, im { 0 };
 	RetuneMessage message { };
 };
 
diff --git a/firmware/common/message.hpp b/firmware/common/message.hpp
index 6cd47317..4326ace1 100644
--- a/firmware/common/message.hpp
+++ b/firmware/common/message.hpp
@@ -706,13 +706,19 @@ public:
 class JammerConfigureMessage : public Message {
 public:
 	constexpr JammerConfigureMessage(
-		const bool run
+		const bool run,
+		const uint32_t type,
+		const uint32_t speed
 	) : Message { ID::JammerConfigure },
-		run(run)
+		run(run),
+		type(type),
+		speed(speed)
 	{
 	}
 
 	const bool run;
+	const uint32_t type;
+	const uint32_t speed;
 };
 
 class DTMFTXConfigMessage : public Message {
diff --git a/firmware/graphics/PREVIOUS.png b/firmware/graphics/PREVIOUS.png
new file mode 100644
index 00000000..f3db19c0
Binary files /dev/null and b/firmware/graphics/PREVIOUS.png differ