Download Odin Flash Tool For Android Phone, Then Extract It
Now Download >> TWRP Recovery
Then Go To Settings >> About Phone >> Tap On Build Number 5 To 7 Times You Will See Developer Option
Now Tap On Developer Option >> Then Enable USB Debugging And Also Enable OEM Unlocking
Now Boot Your Smartphone In >> TWRP Recovery Mode
To Boot Phone In Recovery Mode You Have To Turn Of Your Smartphone Then Press Volume Up + Power Botton Together To Turn On >> Recovery Mode
Then Select >> Reboot To Bootloader, After Some Time You Will See Downloading Mode
Now Cannect Your Smartphone To Computer Using USB Cable, Then Open >> Odin Flash Tool In Your PC
Now ID:COM Tab On Your Odin Will Turn Blue Which Means Your Phone Is Successfully Recognized By Odin Flash Tool, If It Doesn’t Reconnect Your Device And Check Again
Now Tap On >> AP Button On Odin Flash Tool And Select >> TWRP Recovery For Smartphone You Downloaded Earlier
Now Tap On >> Start Button
After Some Time You Will See “Pass” Button On Screen, It Means TWRP Recovery Successfully Installed On Smartphone
@physwizz Yep, something dodgy about that whole thread.
Best to look at S9 / S10 Exynos variants that have known working TWRPs. Main difference is in the partition naming / layout and obviously the kernel and supporting files for things like charger.
While I managed to hack my way to making the first working TWRP for the Unihertz Atom I am really just lost in a lot of this but through a tenacious mindset (and probably some luck) managed to make that TWRP work for the Atom. However the way I went about it was nothing like the suggestions in the thread on how to create your own TWRP. From what I understand (and this is nothing certain) I believe having a TWRP from a phone with the same chipset or CPU will make it easier to modify TWRP to work on the A20.
From vndnguyen's Phone Info the A20 I have shows an Exynos 7885 chipset. From gsmarena.com they show the A20 as having an Exynos 7884 chipset. I suspect mine is just a minor upgrade to the original.
According to gsmarena.com the Samsung Galaxy A8 has the Exynos 7885 chipset and the A8 does have TWRP available for it. I think that will be my starting point.
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