[Samsung Galaxy A20 Questions & Answers] braindrop:
there are some instructions how to install twrp or lineage on nnthe samsung galaxy a20e. it took me a while to manage it, for one part because it seems sometime i did not do everything exactly like it was described (old fault of mine...) sometimes i found some explication in another instruction.

this is why i post my experiences, to encourage those who also struggle with problems, don't hesitate, sometimes it only takes a bit longer, but also because some things i still don't understand, maybe somebody can explain me what happened..

naturally, firsty of all i first had to install twrp. so i searched for instructions and found some, including liks to download the twrp.tar for my model. some of them i was able to flash by odin, but when i then restarted the phone it only showed a black screen with some pink in the middle, with some fantasy i could read a slight samsung or samsung a20 in it. this happened when i tried to restart in recovery to flas disable-dm-verity, also when i tried to restart direct to system. with all the attempts i got very experienced in flashin back stock rom...

then i found a working recover after restart to recovery i got my twrp screen and was able to flash the no-dm-verity or magisk.

so next i tried to flash the lineage (unofficial lineage 17.zip) but always got the message invalid zip format. tried to unzip and zip again but no way. so i thought i might get lucky with adb sideload, entered the twrp advanced and clicked adb sideload, the screen told me starting adb sideload but the phone could not be detected by the computer. the computer detected it when switched on or in fastboot, so it seems the sideload did not really start.

so i searched the interenet for roms because i really wanted to get rid of google and a million of apps in the stock that i don't need. i found the links to andyyans gsi and several other zips.

as i was not used to the gsi installation i thought i better stick on what i know and tried to install another zip. but most of the time i got the invalid zip message or the zip is for another phone although i downloaded it for the a20e. but then twrp accepted the crdroid.zip (eureka) i downloaded, i was very happy, after the instalation was finished i restarted the phone and the screen went black, turned off and it seemed not pressing to download, to recovery or to start changed anything. i also tried with pressing vol up, vol down and conecting with computer but also no downloadmode started. so i pressed very long always several buttons and after a while the phone vibrated by pressing long vol down and power, but no screen. after it vibrated sometimes like this i turned to vol up and power, it vibrated again and finally twrp started. although the phopne was fully charged when i started the process, it now had only 8% battery.

so i charged the phone again, flashed the stock rom and twrp to try again to find a solution. at this time i also found an instruction that explained why after flashing twrp the system can't recognize the folders (downloads, music... ) and only gives them combinations of letters and ciffers, i have to decrypt it in twrp, wipe, format data, yes and this problem is solved. i don't know it happens always and who made the instructions to flash twrp thought this is common knowledge but in the first innstructions i read it was not mentioned.

i tried again to flash zips and now got a funny eroor message from twrp, unable to zip, this zip is for a20 but this phone is a a10. i tried another zip, the installation started and in the text i could see that it was for a10... so somehow twrp was sure to live on na a10, how could this be??? i thought maybe the twrp was for the a10 (it was a 3.4.x), so i again downloaded a tar directly from the page of twrp for the a20. but when flashed this twrp (3.5.x) and tried to restart to recovery (or to system) the phone was still in downloadmode and refused the custom rom. i had to flash back to stock, then flash again the twrp3.4 that thought my device is a a10, then i could flash the new twrp3.5 i was sure it was from the original site and for my device. i don't know the 3.4 was patched, i got the downloadlink from one how-to-site, but i did not read anything that it was patched...

but after testing all the zips that did not work, and also with the new twrp i was not able to sideload i decided it is time to learn how to handle the xz. so i extracted first the lineage 18, installed it by clicking install image (after wiping) but again the phone turned black and i had to press a while to get twrp restarted and the battery again was nearly down.

the same process worked with the lineage 17, so this is what is now innstalled. both where the correct ab versions, i checked before with treble info what version i need.

so, can anybody explain me

-what happened with my battery when the phone turned to apparently death?

-why could twrp think my phone is a a10, would a twrp for a10 work on my phone?

-is it possible that the sideload feature does not work on this phone?

¡¡¡and many thanks to all those who upload roms and instructions so people like me can make their phones a bit more like they want them!!!