Simple patcher for Flipper Zero FAPs to change the target SDK API in the manifest ; it doesn't mean the patched app will work correctly (!), it only allow it to be loaded

flipper_fap_manifest_sdk_api_patcher.py

import re, pathlib

target_version_major = 2
target_version_minor = 0

"""md
* https://github.com/flipperdevices/flipperzero-firmware/blob/0.69.1/lib/flipper_application/flipper_application.c#L45
* https://github.com/flipperdevices/flipperzero-firmware/blob/0.69.1/lib/flipper_application/flipper_application.c#L116
* https://github.com/flipperdevices/flipperzero-firmware/blob/0.69.1/lib/flipper_application/application_manifest.c#L12
* https://github.com/flipperdevices/flipperzero-firmware/blob/0.69.1/lib/flipper_application/application_manifest.h#L15
* https://github.com/flipperdevices/flipperzero-firmware/blob/0.69.1/lib/flipper_application/elf/elf_file_i.h#L42
* https://github.com/flipperdevices/flipperzero-firmware/blob/0.69.1/scripts/fbt_tools/fbt_sdk.py#L250
* https://github.com/flipperdevices/flipperzero-firmware/blob/0.69.1/firmware/targets/f7/api_symbols.csv
"""

pattern = f'(HDGR\1...)(:?[^{chr(target_version_minor)}]...|..[^{chr(target_version_major)}].)'
repl = f'\\1{chr(target_version_minor)}\0{chr(target_version_major)}\0'
for fap_file in pathlib.Path('.').glob('**/*.fap'):
#for fap_file in pathlib.Path('.').glob('*.fap'):
  print(f'-- {fap_file}')
  with fap_file.open('rb') as fh:
    fap_data = fh.read()
  
  fap_data, replaced = re.subn(pattern.encode(), repl.encode(), fap_data)
  if replaced < 1:
    print('Not patched: version not found or already correct')
  elif replaced > 1:
    print('! Not patched: version found multiple times')
  else:
    with fap_file.open('wb') as fh:
      fh.write(fap_data)
    print('Patched')
  print()