[Galaxy S III I9305 (4G LTE + 2GB RAM) Android Deve] alec.claire:
First of all:

Using twrp v3.0.2-1 seems to be the solution for successful flashing on i9305.

Okay, so here it is how it all happened in more detail in my previous post:

1. I've had RR running for nearly two years and yesterday I was about to sell the phone however the buyer changed his mind. I had backup made with the newest twrp-3.3.1-0-i9305.img, however after restoring it back and boot the system started to popping up these prompts that cannot be dismissed unfortunately that everything stopped working - one after another.

2. I couldn't flash anything from phones memory (error 7), and SD card was unrecognisable. So, I flashed stock ROM and then auto-rooted with CF-auto-root. Why I did that? As i mentioned, the SD card was unrecognisable in TWRP and formatting on PC and other phone hasn't helped. Only after "mount" it was visible on my computer but not in TWRP. So, stock rom, format the card and voila - recognised by TWRP. BTW - stock ROM also helps for corrupted EFS partition when LTE won't work.

3. Later - again error 7. I've dealt with error 7 be removing first line in rom's updater-script file. I've tried flashing both (separately after full wipe each) RR-N-v5.8.5-20190219-i9305-rodman01 and RR-N-v5.8.5-20170928-i9305-Final and then in both instances again this non-dismissible prompts that every app failed with google framework at the forefront - and that was before flasgin Gapps. So, I'm guessing that wipe with twrp-3.3.1-0-i9305 was somehow incomplete? i don't know. Anyway, flashing Gapps didn't helped with prompts and here we are - my previous post.

So what I did after Oswald Boelcke response to my post:

1. Flashed stock rom, booted, set-up necessary apps, flashed CF-auto-root, booted, flashed TWRP v3.0.2-1, TWRP backup.

2. Full wipe, flashed RR-N-v5.8.5-20190219-i9305-rodman01, booted, TWRP backup, flashed Magisk-v19.2, booted, TWRP backup.

3. Flashed open_gapps-arm-7.1-stock-20190530, the phone starts restarting after using it for a while.

4. Restored RR-N-v5.8.5-20190219-i9305-rodman01 TWRP backup. SIM card not working. Restored EFS partition form stock rom backup, boot still not working.

5. Restored stock rom from TWRP backup. Cellular network working but, and what is interesting, no apps set by me. Tried to block the screen with power button - no success - the screen was constantly up. After removing battery and restart infinite boot loop on Samsung logo.

6. TWRP full wipe. Flashed fresh stock rom via Odin. Booted and shock - all my apps, icons on desktop just how I set them. How? Beyond me! Really. Yes, I did a full wipe.

7. Again CF-auto-root, TWRP v3.0.2-1, TWRP backup of stock rom, TWRP full wipe, flashing RR-N-v5.8.5-20190219-i9305-rodman01, booted, yet again prompts that everything stopped working. All without flashing OpenGapps.

[IMG="Error prompt after clean flash of RR"]https://ibb.co/8PSQQcH[/IMG]

8. And the story repeats. Full wipe, flashing RR-N-v5.8.5-20170928-i9305-Final, flashed Magisk-uninstaller, flashed RR-N-v5.8.5-20190219-i9305-rodman01, SIM not recognised (unknown baseband), EFS restored from stock rom (I don't have separate "modem" in the backup), still cellular network not working. So, here we are now - SIM not recognised. Found your old post about flashing modem form https://mega.nz/#F!Ih0TySJb!GJhP97EFLPCM_cdKpKfhew!BgEH0TqK. However not successful with the CSC from the stock ROM I've put in (French Orange with Security Patch Level	2017-07-01 from SammyMobile.com).

9. Again full wipe, downloaded stock ROM for the country of distribution of this particular device, flashed it, CF-auto-root, flash TWRP, backup, full wipe, flashed yet again RR-N-v5.8.5-20190219-i9305-rodman01 and still no SIM card. Tried flashing modem for particular CSC still no luck.

So, I'm stuck on no SIM card now while running RR.

UPDATE: I've found a solution.

Found my old post - https://xdaforums.com/showpost.php?p=73582379&postcount=7385

However, the method with "default" TWRP wipe described didn't work. BUT, I flashed the mentioned in the post RR-N-v5.8.3-20170716-i9305-Official. Flashed it, booted - cellular network preset, flashed Magisk-uninstaller, flashed RR-N-v5.8.5-20190219-i9305-rodman01, booted and SIM present. Hope this helps someone.