I've tried flashing a few times, but no luck. I am not concerned about ... battery can not last even 24 hours on standby, where previously it could for 3-5 days. I'm way past 15 days allowed to open a dispute on Ali, and since phone was paid in May, I can not even open a case with credit card company. Seller is just not responding through Ali messaging.
If none of this works - then it's nearly useless and just a nice brick or paperweight. For me, plan is to use it - worst come to worst - as a mini wireless security camera monitor, keep it connected to usb wall charger & watch streaming video feed from home security system, if not to watch youtube.
Have you spoken to your credit card issuer about disputing the charge - when did you receive it, in early/mid July like me ? It doesn't hurt to call your CC company. As for Umidigi - did you also try to post on their FB page and see what they say (if they respond !!) but i agree, most likely - you get the runaround or they will just ignore you & they do with everyone else. Stupid Sarah ... or whatever the screen ID name is/was on AliE.