uvk5: Add OSFW-bd90ca3 as found in the wild

This firmware is installed on radios being sold by vendors and it
appears to be reasonably compatible with the OEM configuration as
confirmed in the associated bug. A few deltas have been shaken out
in the bug, and I'm sure there are more, but this seems serviceable
enough.

Fixes #11488

chirp/drivers/uvk5.py

@@ -127,7 +127,7 @@
 u8 scan_resume_mode;
 u8 auto_keypad_lock;
 u8 power_on_dispmode;
-u8 password[4];
+u8 password[8];
 
 #seekto 0xea0;
 u8 keypad_tone;
@@ -257,9 +257,6 @@
 # battery save
 BATSAVE_LIST = ["OFF", "1:1", "1:2", "1:3", "1:4"]
 
-# Backlight auto mode
-BACKLIGHT_LIST = ["Off", "1s", "2s", "3s", "4s", "5s"]
-
 # Crossband receiving/transmitting
 CROSSBAND_LIST = ["Off", "Band A", "Band B"]
 DUALWATCH_LIST = CROSSBAND_LIST
@@ -282,7 +279,6 @@
 
 WELCOME_LIST = ["Full Screen", "Welcome Info", "Voltage"]
 KEYPADTONE_LIST = ["Off", "Chinese", "English"]
-LANGUAGE_LIST = ["Chinese", "English"]
 ALARMMODE_LIST = ["SITE", "TONE"]
 REMENDOFTALK_LIST = ["Off", "ROGER", "MDC"]
 RTE_LIST = ["Off", "100ms", "200ms", "300ms", "400ms",
@@ -638,6 +634,8 @@ class UVK5RadioBase(chirp_common.CloneModeRadio):
     _upload_calibration = False
     _pttid_list = ["off", "BOT", "EOT", "BOTH"]
     _steps = [1.0, 2.5, 5.0, 6.25, 10.0, 12.5, 25.0, 8.33]
+    _langs = ["Chinese", "English"]
+    _backlight = ["Off"] + ['%is' % (i + 1) for i in range(5)]
 
     @classmethod
     def k5_approve_firmware(cls, firmware):
@@ -1047,7 +1045,7 @@ def set_settings(self, settings):
             # Backlight auto mode
             if element.get_name() == "backlight_auto_mode":
                 _mem.backlight_auto_mode = \
-                        BACKLIGHT_LIST.index(str(element.value))
+                        self._backlight.index(str(element.value))
 
             # Tail tone elimination
             if element.get_name() == "tail_note_elimination":
@@ -1084,7 +1082,7 @@ def set_settings(self, settings):
 
             # Language
             if element.get_name() == "language":
-                _mem.language = LANGUAGE_LIST.index(str(element.value))
+                _mem.language = self._langs.index(str(element.value))
 
             # Alarm mode
             if element.get_name() == "alarm_mode":
@@ -1681,12 +1679,12 @@ def get_settings(self):
 
         # Backlight auto mode
         tmpback = _mem.backlight_auto_mode
-        if tmpback >= len(BACKLIGHT_LIST):
+        if tmpback >= len(self._backlight):
             tmpback = 0
         rs = RadioSetting("backlight_auto_mode",
                           "Backlight auto mode",
                           RadioSettingValueList(
-                              BACKLIGHT_LIST,
+                              self._backlight,
                               current_index=tmpback))
         basic.append(rs)
 
@@ -1758,11 +1756,12 @@ def get_settings(self):
 
         # Language
         tmplanguage = _mem.language
-        if tmplanguage >= len(LANGUAGE_LIST):
+        if tmplanguage >= len(self._langs):
             tmplanguage = 0
         rs = RadioSetting("language", "Language", RadioSettingValueList(
-            LANGUAGE_LIST, current_index=tmplanguage))
-        basic.append(rs)
+            self._langs, current_index=tmplanguage))
+        if self._langs:
+            basic.append(rs)
 
         # Alarm mode
         tmpalarmmode = _mem.alarm_mode
@@ -2069,6 +2068,27 @@ class MaxTalkerTK6(UVK5Radio):
     MODEL = "TK-6"
 
 
+@directory.register
+@directory.detected_by(UVK5Radio)
+class OSFWUVK5Radio(UVK5RadioBase):
+    VARIANT = 'OSFW'
+    _langs = []
+    _backlight = ['Off'] + ['%is' % (i + 1) for i in range(60)]
+
+    @classmethod
+    def k5_approve_firmware(cls, firmware):
+        return firmware in ("OSFW-bd90ca3",)
+
+    def _find_band(self, hz):
+        return _find_band(True, hz)
+
+    def set_settings(self, settings):
+        # Something about this firmware needs this cleared to avoid getting
+        # locked.
+        self._memobj.password.fill_raw(b'\xFF')
+        return super().set_settings(settings)
+
+
 @directory.register
 @directory.detected_by(UVK5Radio)
 class UVK5RestrictedRadio(UVK5RadioBase):