Debugging TP-Link Archer C20 V5 through UART

Hi i'm trying to Debug my TP-Link Router through UART but i can't seem to find the right speed in PuTTY all i'm getting is gibberish that no one can understand it created it's own cursed language and i cant understand shizz, i tried to upload OpenWRT but turned out who ever wrote the installation instructions just did a bad job when it comes to new comers that are new to OpenWRT, they didn't try to make any Warnings or to put a Video on how to do it, if any one knows the right speed or to why i'm getting those gibberish words please help me out

115200 / 8N1 according to the hw page

There are several install methods described at