Retropie not starting after changing memory split (following a tutorial)

[Rapata]

Hi, i have been using a dual boot retropie/librelec build and it was doing great. But today i was messing around following this tutorial https://www.youtube.com/watch?v=EvA_Wfa8Bh0 and when i changed the memory split (in the video around minute 6) it prompted to restart, so i did. But at the moment of the reboot it got stuck on black screen with one raspberry and the white bar like i could write but nothing happens, can't write and doesn't move past this point. SD seems to be fine but i don't know what can i do to solve this problem and hope someone could help.

[k-pi]

Can't see/make out what the video is showing, but Menu > Preferences > Raspberry Pi Configuration > Performance > GPU Memory is the way to increase video memory allocation, then reboot to activate it.

(However, when I tried it for VLC, it didn't seem to make any difference.)

[bensimmo]

Try holding shift down during boot to get into safe mode.
Or
Put the card in something else (e.g. pc) and edit the /boot/confirm.txt file from there .

P.s. I can't read any of the text in that video and no info in the comments.

[bensimmo]

Ok I read the text in that document (shame that's not in the video info)
You mentioned 1 raspberry on boot.
So you have a Pi1 series (B(+)/A(+)/Zero's) so have 256 or 512MB memory, so you cannot set it to 512MB.

Remove that line from config.txt (~ gpu_mem)