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Is this a typo?

Under heading "After the devkit is installed" first line of code sample:
cd ~/flipperZero/official//applications_user
should be:
cd ~/flipperZero/official/applications_user

right?
Thanks for your great work!

Error on compile via "./fbt fap_bc_demo"

Upon attempting to compile the demo; with ./fbt fap_bc_demo.
The terminal returns:

PS C:\Users\MY_USER\flipperZero\official> ./fbt fap_bc_demo
        CC      applications_user\bc_demo\bc_demo.c
        SDKCHK  firmware\targets\f7\api_symbols.csv
applications_user\bc_demo\bc_demo.c: In function 'cbDraw':
applications_user\bc_demo\bc_demo.c:123:27: error: implicit declaration of function 'acquire_mutex' [-Werror=implicit-function-declaration]
  123 |  if ( !(state = (state_t*)acquire_mutex((ValueMutex*)ctx, 25)) )  return ;
      |                           ^~~~~~~~~~~~~
applications_user\bc_demo\bc_demo.c:123:42: error: 'ValueMutex' undeclared (first use in this function)
  123 |  if ( !(state = (state_t*)acquire_mutex((ValueMutex*)ctx, 25)) )  return ;
      |                                          ^~~~~~~~~~
applications_user\bc_demo\bc_demo.c:123:42: note: each undeclared identifier is reported only once for each function it appears in
applications_user\bc_demo\bc_demo.c:123:53: error: expected expression before ')' token
  123 |  if ( !(state = (state_t*)acquire_mutex((ValueMutex*)ctx, 25)) )  return ;
      |                                                     ^
applications_user\bc_demo\bc_demo.c:151:2: error: implicit declaration of function 'release_mutex' [-Werror=implicit-function-declaration]
  151 |  release_mutex((ValueMutex*)ctx, state);
      |  ^~~~~~~~~~~~~
applications_user\bc_demo\bc_demo.c:151:28: error: expected expression before ')' token
  151 |  release_mutex((ValueMutex*)ctx, state);
      |                            ^
applications_user\bc_demo\bc_demo.c: In function 'bc_demo':
applications_user\bc_demo\bc_demo.c:530:2: error: unknown type name 'ValueMutex'
  530 |  ValueMutex         mutex   = {0};
      |  ^~~~~~~~~~
applications_user\bc_demo\bc_demo.c:579:7: error: implicit declaration of function 'init_mutex' [-Werror=implicit-function-declaration]
  579 |  if (!init_mutex(&mutex, state, sizeof(state))) {
      |       ^~~~~~~~~~
applications_user\bc_demo\bc_demo.c:639:29: error: implicit declaration of function 'acquire_mutex_block' [-Werror=implicit-function-declaration]
  639 |    if ( !(state = (state_t*)acquire_mutex_block(&mutex)) ) {
      |                             ^~~~~~~~~~~~~~~~~~~
applications_user\bc_demo\bc_demo.c:710:11: error: request for member 'mutex' in something not a structure or union
  710 |  if (mutex.mutex) {
      |           ^
applications_user\bc_demo\bc_demo.c:711:3: error: implicit declaration of function 'delete_mutex' [-Werror=implicit-function-declaration]
  711 |   delete_mutex(&mutex);
      |   ^~~~~~~~~~~~
applications_user\bc_demo\bc_demo.c:712:8: error: request for member 'mutex' in something not a structure or union
  712 |   mutex.mutex = NULL;
      |        ^
cc1.exe: all warnings being treated as errors
scons: *** [build\f7-firmware-D\.extapps\bc_demo\bc_demo.o] Error 1
API version 19.0 is up to date

********** FBT ERRORS **********
build\f7-firmware-D\.extapps\bc_demo\bc_demo.o: Error 1

I am a total noob...

Typo in README.md

You say to build the fap:

cd ~/flipperZero/official/
./fbt firmware_bc_demo

But I guess you mean:

cd ~/flipperZero/official/
./fbt fap_bc_demo

Trying to get it running on my device, it builds ok with /fbt fap_bc_demo, but the command:
./fbt launch_app APPSRC=bc_demo
fails with this python backtrace:

TypeError: cannot unpack non-iterable FlipperExternalAppInfo object:
  File "/home/flipperzero-firmware/SConstruct", line 49:
    firmware_env = distenv.AddFwProject(
  File "/home/flipperzero-firmware/toolchain/x86_64-linux/python/lib/python3.9/site-packages/SCons/Util.py", line 737:
    return self.method(*nargs, **kwargs)
  File "/home/flipperzero-firmware/scripts/fbt_tools/fbt_dist.py", line 42:
    project_env = env[fw_env_key] = create_fw_build_targets(base_env, fw_type)
  File "/home/flipperzero-firmware/scripts/fbt_tools/fbt_dist.py", line 26:
    return env.SConscript(
  File "/home/flipperzero-firmware/toolchain/x86_64-linux/python/lib/python3.9/site-packages/SCons/Script/SConscript.py", line 597:
    return _SConscript(self.fs, *files, **subst_kw)
  File "/home/flipperzero-firmware/toolchain/x86_64-linux/python/lib/python3.9/site-packages/SCons/Script/SConscript.py", line 285:
    exec(compile(scriptdata, scriptname, 'exec'), call_stack[-1].globals)
  File "/home/flipperzero-firmware/firmware.scons", line 147:
    fwenv["FW_EXTAPPS"] = SConscript(
  File "/home/flipperzero-firmware/toolchain/x86_64-linux/python/lib/python3.9/site-packages/SCons/Script/SConscript.py", line 660:
    return method(*args, **kw)
  File "/home/flipperzero-firmware/toolchain/x86_64-linux/python/lib/python3.9/site-packages/SCons/Script/SConscript.py", line 597:
    return _SConscript(self.fs, *files, **subst_kw)
  File "/home/flipperzero-firmware/toolchain/x86_64-linux/python/lib/python3.9/site-packages/SCons/Script/SConscript.py", line 285:
    exec(compile(scriptdata, scriptname, 'exec'), call_stack[-1].globals)
  File "/home/flipperzero-firmware/site_scons/extapps.scons", line 101:
    app_manifest, fap_file, app_validator = appenv.GetExtAppFromPath(appsrc)

Any idea?

nanopb error during build

After a fresh download on a newly installed machine (debian 12), ./fbt generates this error:

        PROTO   assets/protobuf/application.proto
Traceback (most recent call last):
  File "/home/fz/official/./lib/nanopb/generator/nanopb_generator.py", line 51, in <module>
    from .proto import nanopb_pb2
ImportError: attempted relative import with no known parent package

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/fz/official/./lib/nanopb/generator/nanopb_generator.py", line 72, in <module>
    import proto.nanopb_pb2 as nanopb_pb2
ModuleNotFoundError: No module named 'proto.nanopb_pb2'
scons: *** [build/f7-firmware-D/assets/compiled/application.pb.c] Error 1

********** FBT ERRORS **********
build/f7-firmware-D/assets/compiled/application.pb.c: Error 1

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