Help identifying the card

[deef137]

I bought a pack of 30 cards. Among them was this one and the SD card was inserted.

It had this written in Japanese in the README file:

=== What is this? ===============================

The unofficial kernel of the original R4.
Modified DSTT YSMenu V6.80.
Since V6.76, it can be booted directly without going through the official kernel.
Since V6.76, soft reset is possible.
The reset method is A + B + X + Y + R + L.
Since V6.77, is it possible to soft reset YSMenu related apps?
It is compatible with Pokemon Black 2 / White 2.

The map itself didn't want to load. After that I backed up the files and started downloading "RetroGameFan Multi Cart Update v7.06". Went through all the files, but the only result I had was an endless "Loading" logo. Tell me, what other options can there be for restoring the firmware of this card