ROM Hack Question Help porting save files from another Switch

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Super.Nova

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Once again, I find myself in need of guidance, this time with restoring my save files...

I had an Erista unit that I destroyed while attempting to install SX Core once I got it (desoldered capacitors by mistake and never been able to restore them since).
I tried following a guide that can be found HERE and HERE but I can't seem to get it to work.
I removed the NAND chip from my Erista, attached to a new Mariko unit, ran a backup of the entire NAND (rawnand file from Hekate) and proceeded to extract my keys.
I keep getting an error while trying to extract TESC keys and running biskeydump from Hekate or SX boot menu results in a black screen, so I then got a biskey file from my brother's Erista unit with success.

I'm not even sure if the keys I acquired should work or not on my Erista backup, but HacDiskMount keeps giving me an error when I test them (FAIL! Entropy: 7.989).
I recall reading that keys are device-specific but could still help with work on other devices and I'm completely oblivious if that was true or false.

In case I have to use biskeys I extracted from my own device (Mariko) and not my brother's (Erista), could anyone point me to a guide on how to extract them?
Would my yet-to-be-acquired Mariko biskeys work on my Erista rawnand?
Is there a way to boot into biskeydump.bin directly from RCM without going into SX boot menu (or possibly ruining my SX Core)?


Any help is appreciated and many thanks in advance.
 

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