mod_fm_radio_88-108mhz.py

# nothing to configure here
# mod changes frequency range of FM RADIO from 76–108 MHz to 88-108MHz (tested by @DO7OO but no warranty anyway)


##--------------------- do not modify below this line ---------------------------------------------------
import os,sys,struct
print('Running',os.path.basename(sys.argv[0]),'mod...')

fw =  bytearray(open(sys.argv[1],'rb').read())



fw[0xA2E4:0xA2E4+4] = b"\x5F\x0A\x00\x00"  # Reg05 = 0x0A5F    -> SEEK_TH[15:8]; BAND[7:6]; SPACE[5:4]; VOLUME[3:0], @DO7OO said that you can change rise SEEK_TH from 0x0A to 0x20 to lower sensitivity.
                                                              #-> Value depends on antenna your are using. 
fw[0x64BC:0x64BC+4] = b"\x6e\x20\xC0\x00"  # MOVS R0, #760     -> MOVS R0, #880 - FM LOW LIMIT




open(sys.argv[1],'wb').write(fw)