L5 runs hot and red LED starts flashing fast 5x-off-5x-off-

Phone working (charging working too), but bq25890-charger without USB charge cable always show 85*C.
I have a L5 from latest delivery batch (end of 2021) not USA.

Now I want to check does bq25890-charger still working with old kernel bu I cant find a correct way to try boot prevision kernel…

I correct understand:
What I have installed:

ii linux-image-5.13.0-1-librem5 5.13.19pureos5
ii linux-image-5.15.0-1-librem5 5.15.9pureos1
ii linux-image-librem5 5.15.9pureos1

I just need change symlink /boot/stb to dtbs/5.13.0-1-librem5/freescale/imx8mq-librem5-r4.dtb?
I see L5 still dont have a tested bootloader menu?
Have I any chance to fix /boot partition if I make mistake or something going wrong? (create backup or maybe boot from SD)
Can anyone give me a link where to find instructions or learn how to L5 booting?

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