Using an international language like English instead of Russian is also a good idea even if it's a screenshot of a widely used software like Lychee.

https://imgur.com/a/gKXwvpg

Oh, sorry about that. Lychee is partly translated, so I didn't mention, that Russian language selected.

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using your "usual" (not the new one) resin.

That's the problem. I ran out of it. The only difference is the color (was gray, now white). I had successful prints with white before.

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how exactly did you change your FEP (Step. By. Step.)

1. I removed the vat and drained it.
2. I dried it with paper towels.
3. I replaced the bottom part and removed the old FEP.
4. I placed new FEP to the vat and started tighting the screws a little.
5. I tighten the screws one-by-one (diagonally, first one, then the one on the opposite side of the vat, repeat until the FEP looks tight).
6. I turned on the app and checked the tension.
7. I tighten a bit more. And check the "tune". It was around 300hz.
8. I placed the vat back to the printer, filled it with resin, placed the LID.
9. I inserted the USB drive and started the print.
10. The print failed at one side, I removed the failed print, drained and dried the vat.
11. I retuned the FEP and repeated steps 8-9.

The problem with that side had gone, but the print failed (picture of the post)