Bootloop on LG logo and strange text

Hi

I had LG phone before, but it was L7 1st gen, so not sure if everything works the same.

I have possibility to buy used LG G3 D855, however it has a problem:
It got stuck on LG logo, however sometimes it goes further and shows "strange text" (right now I don't know what kind of text, not sure if I will get answer from the seller about it).
It (as seller wrote) happened after an update (probably to 6.0).

Could any of You (basing on Yours experience) tell me if it is "standard" bootloop...

Bootloop on LG logo and strange text

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