this fw doesn't fix Hebrew RTL notifications support (all Hebrew notifications text would still be displayed backwards). Changing to Arabic in N&F for this issue, will only work if you stop using Mi Fit
the custom firmware published in this thread is for NONE NFC MB3 and is also very old. good thing you haven't bricked you MB so far. do some searching before flashing!
there are custom FW for NFC version as well,
only the Bold Font English Firmware support showing Hebrew characters and even then, it will be shown Left to Right and you'll need a third party app to "fix" this issue and also stop using Mi Fit completely.