Stuck In a Recovery Startup Loop

Try running Disk Utility First Aid on the hidden Container. Within Disk Utility you will need to click "View" and select "Show All Devices" before the hidden Container appears on the left pane of Disk Utility. Even if the First Aid summary says everything is "Ok", click "Show Details" and scroll back through the report to see if any unfixed errors are listed. If any errors are shown, then run First Aid again until the errors are gone. If after several attempts the errors remain, then you will need to erase the disk (aka delete the "Volume Group") followed by installing macOS & restoring from a backup. You may be able to try installing macOS to an external USB3 SSD so that you can try to mount the internal volume to recover the data or perhaps use a data recovery app.

Try reinstalling macOS over top of itself.

Another option if that fails would be to create a new APFS volume (make sure to give it a unique name) assuming you have at least 80GB of Free storage space. Then install macOS into the new AFPS volume so that you have a good booting OS next to the original non-working OS. This should allow you to boot the laptop into a full copy of macOS again as long as there are no hardware issues. Once you boot to the new OS, then you should be able to access the data on the original macOS boot volume.

If this does not work, then try clearning the NVRAM by using the following command within the Terminal app (located on the Utilities menu on the menu bar):

nvram  -c

Then reboot. This command (as shown) is safe to use on an M-series Mac.

If everything else has failed to work, then you can try a DFU firmware Revive (requires access to another Mac running macOS 14.6.1 Sonoma). Theoretically this should not affect any data on the internal SSD, but if the process fails to complete successfully there is a chance of permanently losing access to the data on the internal SSD. If you have reached this point, then the data is already lost if this process does not work.

If the DFU firmware Revive is successful, but you still have issues, then you may need to perform another DFU firmware Revive.....followed immediately by booting into the Startup Options screen after activating the Mac (I would select "shutdown" after successfully activating the Mac). Then perform a reinstall of macOS (best to install macOS onto a new APFS volume if you have enough Free storage space).

If you are familiar with the command line, the perhaps you access & transfer the data to external media.

I believe these are your only options. There are very few options these days to access data on the internal SSD when the computer is not able to boot normally. Sometimes there just is no way to access the data on the internal SSD.

People should always have frequent and regular backups of their computer and all external media (including the cloud) which contains important & unique data. There are a lot more new ways to permanently lose access to the data on an internal SSD of the recent Macs due to all the hardware, software, and security changes.

Hi,

Try to check your MacBook Pro with Apple Diagnostics if the circumstance you face with is hardware related trouble.

Use Apple Diagnostics to test your Mac - Apple Support

If it doesn't help, you'd better take your MacBook Pro to your local retail AppleStore, Genius Bar or Apple Authorized Service Provider to be examined your MacBook Pro there.

Genius Bar Reservation and Apple Support Options - Apple

Find Locations