[SOLVED]Failing to boot w/ Chinese Characters

So silly me decided to play around with the bootloader. Smart, I know. I was really just tinkering around with fastboot, looking but not touching. But I seem to have accidentally messed with some odd command known as "boot_mode". Typed in "fastboot oem boot_mode" only to receive a "FAILED (remote: Use 'fastboot oem boot_mode rf/wlan/ftm/normal')". So me being my curious and fearless self decided, "alright, what could go wrong?" After entering this command, nothing happened. Just got an "OK" message. When rebooting, instead of seeing the normal OnePLus logo, I get a few Chinese characters and an ellipsis. I can boot into TWRP a-okay, but upon booting to OOS, it either hangs on the Chinese characters or on a black screen. I'm used to Odin with Samsung, so I'm a little new to the whole flashing process - where could I acquire images to reflash? Would this even help my problem? Thanks for any help possible.