Default [Q] adb bootloop fix help

i was trying to flash a different rom onto my tab and it got stuck in bootloop. I tried to boot into recovery mode and it just says downloading forever. I originally used goo manager and I don't think it is supported anymore, not sure if that caused it. I was trying to fix it with adb by connecting it to my laptop, but it wont recognize my device and I cant get into it to change any settings. fixable? thanks

update: I got it connected to adb. how do I reset it? while saving or backing up data, if possible