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I suspecting hardware issue (lcd)
Maybe is something wrong with battery cause battery expend and put pressure on back of lcd.
Please contact seller if you have warranty.
Otherwise you need dissemble phone to see what is wrong.
Also you can try with factory data reset: you will lose all pictures etc.!!! (settings - backup and reset - factory data reset)
Here you can buy umi touch lcd unit (please read all subjects as some screens are for other type of umi phones)
And here is battery
https://m.aliexpress.com/s/item/32761490752.html
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