Revert to stock failed and cannot install custom rom as well. - Moto G5 Plus Questions & Answers

I was running the June patch version of the TWRP flashable stock builds (had hard bricked my phone before so cannot use full stock firmware until and unless I get my hands on the stock Oreo firmware).
As the official Oreo update is out, (https://drive.google.com/file/d/1Zmt...IeF9vauAY/view) I downloaded the zip file and placed it in my internal storage and tried to apply the update, which took me to TWRP, and the update failed. I rebooted to see if everything was ok and it was.
Then, I tried to revert to the stock firmware of the latest edition (to see if I could apply the update) and each time I tried to run the commands or run the flash file, it failed because I was not able to flash the stock recovery. It showed 'N/A' instead of 'bad key' every time on the screen before booting into TWRP.
I gave up and tried to go back to the TWRP build I was using before, and I get this error on TWRP. Why is this happening? (I had formatted my data after entering TWRP, is this th reason?)
Please help guys! Need to get my phone back and running!
Here is an image of what's going on -

Related

OnePlus 2 Stock Recovery

Can someone please post here stock recovery.img for OPT im now on TWRP but i want to install H2OS OTA normally.
Thank you so much
You may have chosen to keep the twrp recovery on your device from beeing overwritten by the stock recovery. This is done in twrp by renameing the "/bin/recovery.sh" (afaik).
Before installation OTA update checks for all checksums of files it will patch. So you will not only need the stock recover but at least to replace the recovery.sh with the original one.
Much easier way is to flash 2.0.2 full (not the OTA!), flash 2.1 OTA, flash SU and reboot in one session from twrp . I have done this and it worked without a problem.
Just make sure your battery is fully charged before
I'm getting an updated binary error. Started getting it in TWRP after flashing a custom kernel. Could you post your stock recovery? Or the stock kernel? (preferably the latter I suppose)
I've tried digging into the full 2.0.1 and 2.1 ROMs to find them, but I can't track them down...
Yes,i need the stock recovery
Well I need stock recovery because of hydrogen OS hope someone have it..
All you need is recovery paparapapa ahahahah
I managed somehow to have back stock recovery
When i flashed TWRP and then Gapps for Hydrogen OS it asked me to stop stock recovery to flash or something so i press dont stop, and voila im back on stock recovery
OnePlus 2 stock recovery -> http://forum.xda-developers.com/oneplus-2/general/oneplus-2-stock-recovery-t3217848

4.5.1 Update with Root and Recovery

Trying to update the 4.5.1 and it seemed to have gone fine until it automatically reboots into TWRP recovery. Upon rebooting into system, it states the update failed. With TWRP having all those jumbled folder names right now (has this been fixed yet?) it's hard to see if the update downloaded somewhere to internal storage, and further if it could be flashed even if I found it. Is updating with an OTA like this possible? I know on basically all other phone it is not. Has anyone gotten the update to work while being unlocked, rooted, with TWRP? Thanks.
xgerryx said:
Trying to update the 4.5.1 and it seemed to have gone fine until it automatically reboots into TWRP recovery. Upon rebooting into system, it states the update failed. With TWRP having all those jumbled folder names right now (has this been fixed yet?) it's hard to see if the update downloaded somewhere to internal storage, and further if it could be flashed even if I found it. Is updating with an OTA like this possible? I know on basically all other phone it is not. Has anyone gotten the update to work while being unlocked, rooted, with TWRP? Thanks.
Click to expand...
Click to collapse
Generally you need to reflash the previous Full ROM with TWRP and then flash the OTA on top for it to work as the system must be unmodified. Alternatively, you can just flash the latest Full ROM. Currently those are not available, but that's generally how it works.
If u have installed twrp before updating the stock rom, I guess we have to wait for full rom of latest update 4.5.1 which can be flashed via twrp.
P.s. FLASHING the dwnloaded update via twrp will gives u error.. So have to wait for full rom. ?

P9 lite custom rom setup troubles + softbrick

Hi everyone,
i hope someone has time to help me on this. I had some experience with flashing custom roms with Lenovo a6000 and some Samsung phones, but it seems there's some things that are different with p9 Lite (L21), or some things i don't understand.
First things first, i've followed steps on how to install LineageOS (LineageOS-14.1-20171228-hi6250-UNOFFICIAL-HassanMirza01) over stock Nougat rom (B381), so i've unlocked the bootloader, flashed Revolution recovery via fastboot, and then installed the rom, gapps, magisk... What happened after installing magisk is a sudden restart, and after that, i got stuck at the LineageOS boot logo (i've let it work for over an hour until i gave up)... Thinking magisk was a problem, i also tried SuperSU, but had the same situation - restart before it finnished. Afterwards i've tried flashing EliteTWRP and after success, i've flashed the Omni-7.1.2-20171201-hi6250-HOMEMADE-HassanMirza01.zip, which also got stuck at the Omni boot logo, but i was able to do installation both with magisk and then again with supersu. Reading through XDA gave me some suggestions, one of them being to format userdata, which gave me a message that the command is not allowed.
Then i made a huge mistake of accidentally formatting internal dalvik+cache+data+system+INTERNAL STORAGE via recovery... After that, the Omni boot logo stopped showing, and i've been trying to repair it since then.
What i've tried so far is:
- fastboot flash boot, recovery (stock), system:
from what i've read there's also a CUST.img that i need to flash, but when i extract update.app that i had installed before all this, it doesn't contain it. I've tried flashing cust.img from another package, but it gives an error.
- after flashing boot, recovery and system.img, i've tried copying various update.app versions to dload on sdcard, then forcing update via pwr+volup+voldown, but every single one gives me "Software install failed - incompatibility with current version - please download the correct update package"... the same happens with downgrade package update.app.
It seems that only B381 update.app, when copied to sdcard and executed in the same way, gives a somewhat different message, instead of "incompatibility with current ver..." it says "Get help from http:..."
- adb shell dd if=/external_sd/oeminfo of=/dev/block/platform/hi_mci.0/by-name/oeminfo // re-locked my bootloader
- i can unlock the bootloader and install twrp again via fastboot oem unlock *************** and fastboot flash recovery
- i've also tried unbricking options via P9 Lite Toolkit app, no success.
- HiSuite recovery option says device is not supported for system recovery
Any suggestions ?
hexahive said:
Hi everyone,
i hope someone has time to help me on this. I had some experience with flashing custom roms with Lenovo a6000 and some Samsung phones, but it seems there's some things that are different with p9 Lite (L21), or some things i don't understand.
First things first, i've followed steps on how to install LineageOS (LineageOS-14.1-20171228-hi6250-UNOFFICIAL-HassanMirza01) over stock Nougat rom (B381), so i've unlocked the bootloader, flashed Revolution recovery via fastboot, and then installed the rom, gapps, magisk... What happened after installing magisk is a sudden restart, and after that, i got stuck at the LineageOS boot logo (i've let it work for over an hour until i gave up)... Thinking magisk was a problem, i also tried SuperSU, but had the same situation - restart before it finnished. Afterwards i've tried flashing EliteTWRP and after success, i've flashed the Omni-7.1.2-20171201-hi6250-HOMEMADE-HassanMirza01.zip, which also got stuck at the Omni boot logo, but i was able to do installation both with magisk and then again with supersu. Reading through XDA gave me some suggestions, one of them being to format userdata, which gave me a message that the command is not allowed.
Then i made a huge mistake of accidentally formatting internal dalvik+cache+data+system+INTERNAL STORAGE via recovery... After that, the Omni boot logo stopped showing, and i've been trying to repair it since then.
What i've tried so far is:
- fastboot flash boot, recovery (stock), system:
from what i've read there's also a CUST.img that i need to flash, but when i extract update.app that i had installed before all this, it doesn't contain it. I've tried flashing cust.img from another package, but it gives an error.
- after flashing boot, recovery and system.img, i've tried copying various update.app versions to dload on sdcard, then forcing update via pwr+volup+voldown, but every single one gives me "Software install failed - incompatibility with current version - please download the correct update package"... the same happens with downgrade package update.app.
It seems that only B381 update.app, when copied to sdcard and executed in the same way, gives a somewhat different message, instead of "incompatibility with current ver..." it says "Get help from http:..."
- adb shell dd if=/external_sd/oeminfo of=/dev/block/platform/hi_mci.0/by-name/oeminfo // re-locked my bootloader
- i can unlock the bootloader and install twrp again via fastboot oem unlock *************** and fastboot flash recovery
- i've also tried unbricking options via P9 Lite Toolkit app, no success.
- HiSuite recovery option says device is not supported for system recovery
Any suggestions ?
Click to expand...
Click to collapse
http://www.meticulus.co.vu/p/hi6250-custom-rom-installation.html
Thanks.
I've managed to revert to stock by following one thread here on XDA. What I did was install L21C432oemInfo-DS.zip, then wipe everything via TWRP, and finally copy the L21C432B130 update app to dload folder on sd card, then the setup went without any problems.
I am now doing a full backup via Meticulus TWRP before i do anything.
There's one thing i dont understand about AOSP and RessurectionRMX roms, it says they're EMUI5 based - does that mean i'd have to update to EMUI5 based stock rom before i try installing it (prerequisites don't mention anything emui related) or that simply means the rom contains EMUI5 ?
hexahive said:
Thanks.
I've managed to revert to stock by following one thread here on XDA. What I did was install L21C432oemInfo-DS.zip, then wipe everything via TWRP, and finally copy the L21C432B130 update app to dload folder on sd card, then the setup went without any problems.
I am now doing a full backup via Meticulus TWRP before i do anything.
There's one thing i dont understand about AOSP and RessurectionRMX roms, it says they're EMUI5 based - does that mean i'd have to update to EMUI5 based stock rom before i try installing it (prerequisites don't mention anything emui related) or that simply means the rom contains EMUI5 ?
Click to expand...
Click to collapse
You must already be on EMUI 5 to install EMUI5 based ROMs.

Help with soft brick

Hi guys,
I got the ASUS Zenfone 3 Zoom and started playing with it. Unfortunately I managed to soft brick it and somehow I can't go back to stock. Here are all the things I did. I would be happy to get any ideas what to try next:
1. unlocked the bootloader - using asus's official unlock tool
2. flashed twrp recovery - twrp-3.2.1-0-Z01H-20180304.img, using:
adb reboot bootloader
fastboot flash recovery twrp.img
3. updated asus's firmware to the latest official one:
copying UL-Z01H-WW-71.60.139.30.zip onto internal memory
android detects the update and applying it using android
4. Enabling lock pattern at boot (from android settings). Correct pattern required even when booting into recovery
5. Installing supersu via twrp:
adb reboot recovery
installing supersu
wiping caches (the cache partition cannot be wiped)
6. SuperSu working (tested via android)
7. Reading about Magisk. Trying to install magisk via twrp. Magisk's installer complained that the system is not vanilla (due to SuperSu modifications). Have to uninstall SuperSu to return to previous state.
8. Tried uninstalling SuperSu from the program itself (in android). The uninstaller got stuck. The phone become unresponsive and had to reboot.
9. Found a script packaged as an executable zip (to be installed via twrp) that will uninstall SuperSu and return system to pristine state (SuperSu makes a backup of the files it changes before installation) - UPDATE-unSU-signed.zip. Uninstallation worked.
10. Magisk installation still complained about the bootloader. Then things started to go wrong. I unpacked the latest firware UL-Z01H-WW-71.60.139.30.zip, took out boot.img and tried to flash just the bootloader
fastboot flash boot boot.img
11. Upon reboot the phone got stuck at the ASUS logo. Reboot into recovery and into fastboot still works (soft brick). Still shows unlock pattern at boot.
12. I tried flashing the original firmware using TWRP (install a zip). However the installation threw some errors. Unsuccessful.
13. I've tried flashing the system.img from the original firware using fastboot but still it's stuck at the ASUS logo at boot.
fastboot flash system system.img
Here I am stuck. I've read that TWRP cannot install properly the ASUS official firmware but if you flash the original recovery, it can probably flash it properly. Another thing that I think might explain why I cannot get out of the soft brick is that I've enabled the lock pattern at boot, which effectively encrypted some parts of the phone and I have a strong feeling this interferes with the boot process. I will look for a script/installable zip (via twrp) that can remove the lock.
I really need ideas/suggestions before I make something that will turn my phone into a hard brick. Thanks.
What you need to do is flash stock MM recovery from bootloader using "fastboot flash recovery recovery.img"
Since it came with MM preloaded you'll have to install the ROM using stock recovery via adb. It'll take a while, but after that you should upgrade to the latest MM update.
After that, update to any Nougat patch update you wish to receive, because I still haven't figured out yet how to apply them all with @shakalaca's recovery images.
Once you're done, you can install twrp again and flash magisk.
Good luck and hope this helped you
Thanks
+)KEV1N(+ said:
What you need to do is flash stock MM recovery from bootloader using "fastboot flash recovery recovery.img"
Since it came with MM preloaded you'll have to install the ROM using stock recovery via adb. It'll take a while, but after that you should upgrade to the latest MM update.
After that, update to any Nougat patch update you wish to receive, because I still haven't figured out yet how to apply them all with @shakalaca's recovery images.
Once you're done, you can install twrp again and flash magisk.
Good luck and hope this helped you
Click to expand...
Click to collapse
Thanks,
I tried to find a stock recovery images but unsuccessful. Can you tell me where to get it from?
Here's a link to Shakalaca's recovery images.
In the Old folder you'll find MM stock recoveries.
https://mega.nz/#F!p90wgAaY!l1JbJilmAUEKTKWu43pT9w!I89QgZpK
Flash 11.40.86.75 recovery
Boot into recovery
Flash 11.40.86.75 stock rom via adb (it'll take a while)
Once it's done, boot into Android.
Download your respective region's latest MM rom.
Send it to your micro sd.
Install it once Android detects the update file.
(It won't work with custom recovery. I tried every recovery Shakalaca has and only those two seem to work)
Once on the latest MM rom install any nougat patch update you wish to apply, because once you have a nougat rom, you can't boot stock recovery. (As far as my testings went)
So if I were you, I'd go for any update after the zenui 4.0 update since it's a bit better looking imo.
After that final update you can flash TWRP to root your phone. I prefer using magisk, since it doesn't modify the system files.
All you need to do is flash magisk and that's it. No need for SuperSU or anything else. And by any means, do NOT wipe your cache partition once you flash TWRP, otherwise you'll get stuck on the Asus logo during boot.
If you wish to retain the "certified" status in google play store's device certification, do NOT go into the play store before installing magisk. Also, don't delete play store data, otherwise you'll lose your previous purchases.
This post was longer than I initially thought it'd be, but I guess this sums it up pretty well.
Good luck
+)KEV1N(+ said:
Here's a link to Shakalaca's recovery images.
In the Old folder you'll find MM stock recoveries.
-- [link] removed due to XDA regulations
Flash 11.40.86.75 recovery
Boot into recovery
Flash 11.40.86.75 stock rom via adb (it'll take a while)
Once it's done, boot into Android.
Download your respective region's latest MM rom.
Send it to your micro sd.
Install it once Android detects the update file.
(It won't work with custom recovery. I tried every recovery Shakalaca has and only those two seem to work)
Once on the latest MM rom install any nougat patch update you wish to apply, because once you have a nougat rom, you can't boot stock recovery. (As far as my testings went)
So if I were you, I'd go for any update after the zenui 4.0 update since it's a bit better looking imo.
After that final update you can flash TWRP to root your phone. I prefer using magisk, since it doesn't modify the system files.
All you need to do is flash magisk and that's it. No need for SuperSU or anything else. And by any means, do NOT wipe your cache partition once you flash TWRP, otherwise you'll get stuck on the Asus logo during boot.
If you wish to retain the "certified" status in google play store's device certification, do NOT go into the play store before installing magisk. Also, don't delete play store data, otherwise you'll lose your previous purchases.
This post was longer than I initially thought it'd be, but I guess this sums it up pretty well.
Good luck
Click to expand...
Click to collapse
Thanks, I managed to flash 11.40.86.75 and stock ROM using your instructions. I will look now into updating and applying magisk. Just a final question. You mentioned to install Nougat patch update and not a full firmware, but my phone came preloaded with Nougat. Will this be a problem? I installed stock 71.60.139.30 and it worked fine (i was able to boot into twrp).
mollonado said:
Thanks, I managed to flash 11.40.86.75 and stock ROM using your instructions. I will look now into updating and applying magisk. Just a final question. You mentioned to install Nougat patch update and not a full firmware, but my phone came preloaded with Nougat. Will this be a problem? I installed stock 71.60.139.30 and it worked fine (i was able to boot into twrp).
Click to expand...
Click to collapse
Sorry I misread your comment. I'm updating to the latest ROM and installing TWRP. Thanks for the help.
mollonado said:
Sorry I misread your comment. I'm updating to the latest ROM and installing TWRP. Thanks for the help.
Click to expand...
Click to collapse
Glad to help!
---------- Post added at 01:33 PM ---------- Previous post was at 01:30 PM ----------
mollonado said:
Thanks, I managed to flash 11.40.86.75 and stock ROM using your instructions. I will look now into updating and applying magisk. Just a final question. You mentioned to install Nougat patch update and not a full firmware, but my phone came preloaded with Nougat. Will this be a problem? I installed stock 71.60.139.30 and it worked fine (i was able to boot into twrp).
Click to expand...
Click to collapse
It came preloaded with Nougat? Interesting.
+)KEV1N(+ said:
Glad to help!
---------- Post added at 01:33 PM ---------- Previous post was at 01:30 PM ----------
It came preloaded with Nougat? Interesting.
Click to expand...
Click to collapse
Hi I managed to flash stock ROM - 71.60.139.30, but after that I can't flash twrp - twrp-3.2.1-0-Z01H-20180304.img. I tried with:
adb reboot bootloader
fastboot flash recovery twrp.img
but when I try to boot into recovery with:
adb reboot recovery
it goes into the stock recovery. Is there something I missed? Do I need to downgrade to flash TWRP?
mollonado said:
Hi I managed to flash stock ROM - 71.60.139.30, but after that I can't flash twrp - twrp-3.2.1-0-Z01H-20180304.img. I tried with:
adb reboot bootloader
fastboot flash recovery twrp.img
but when I try to boot into recovery with:
adb reboot recovery
it goes into the stock recovery. Is there something I missed? Do I need to downgrade to flash TWRP?
Click to expand...
Click to collapse
Quick question: which of these warnings do you get when you boot?
https://www.androidauthority.com/go...rrupted-and-modified-android-software-629180/
Also, did you try power cycling to get it to boot?
And since the version number made such a large jump, I believe they must have changed something internally with the latest update and that it's probably going to be one of the last Nougat updates before Oreo (which was delayed until June).
I still need to update to that version to check it out, but I might reset soon since I was waiting for Oreo to reset.
+)KEV1N(+ said:
Quick question: which of these warnings do you get when you boot?
https://www.androidauthority.com/go...rrupted-and-modified-android-software-629180/
Also, did you try power cycling to get it to boot?
And since the version number made such a large jump, I believe they must have changed something internally with the latest update and that it's probably going to be one of the last Nougat updates before Oreo (which was delayed until June).
I still need to update to that version to check it out, but I might reset soon since I was waiting for Oreo to reset.
Click to expand...
Click to collapse
I have the Orange warning. It looks a bit different but the wording is the same. Yes, i tried powercycling and still I boot into the stock recovery. What can I do now? Is it possible to downgrade? I am not sure if I boot into stock recovery if it will let me flash an older stock ROM.
mollonado said:
I have the Orange warning. It looks a bit different but the wording is the same. Yes, i tried powercycling and still I boot into the stock recovery. What can I do now? Is it possible to downgrade? I am not sure if I boot into stock recovery if it will let me flash an older stock ROM.
Click to expand...
Click to collapse
I read here - https://android.gadgethacks.com/how-to/twrp-101-install-best-custom-recovery-for-android-0179547/
that once you flash twrp Android upon next reboot might overwrite it with the stock recovery. Is that possible?
mollonado said:
I read here - https://android.gadgethacks.com/how-to/twrp-101-install-best-custom-recovery-for-android-0179547/
that once you flash twrp Android upon next reboot might overwrite it with the stock recovery. Is that possible?
Click to expand...
Click to collapse
So, how did you flash TWRP exactly? Using that guide? Or flashed through bootloader?
And to answer your question: yes, it happens sometimes.
+)KEV1N(+ said:
So, how did you flash TWRP exactly? Using that guide? Or flashed through bootloader?
And to answer your question: yes, it happens sometimes.
Click to expand...
Click to collapse
Hi, I managed to get around it by directly booting into TWRP from fastboot. Yes, apparently unless I flash some TWRP files to the system partition upon next reboot, the recovery will return to stock. Anyway, I managed to install Magisk and Exposed framework and have been poking with those two for the last couple of days.
The youtube vanced app is great, but I found something that worries me. I can't login to facebook/twitter. I checked and the reason is I can't connect to the facebook.com or twitter.com https sites (even over chrome). I think either:
- I've installed some module which is messing with that
- my rooted phone is hacked
I've installed a module that is meant as ad blocker, that updates the hosts file. However I removed all modules and the problem remains. I really don't wanna start all over again just to check. And even if I reflash and it works, I will not know what caused it and how to fix it myself next time. Do you have any ideas on how to figure out what the problem is?
Regards,
mollonado said:
Hi, I managed to get around it by directly booting into TWRP from fastboot. Yes, apparently unless I flash some TWRP files to the system partition upon next reboot, the recovery will return to stock. Anyway, I managed to install Magisk and Exposed framework and have been poking with those two for the last couple of days.
The youtube vanced app is great, but I found something that worries me. I can't login to facebook/twitter. I checked and the reason is I can't connect to the facebook.com or twitter.com https sites (even over chrome). I think either:
- I've installed some module which is messing with that
- my rooted phone is hacked
I've installed a module that is meant as ad blocker, that updates the hosts file. However I removed all modules and the problem remains. I really don't wanna start all over again just to check. And even if I reflash and it works, I will not know what caused it and how to fix it myself next time. Do you have any ideas on how to figure out what the problem is?
Regards,
Click to expand...
Click to collapse
First off, my apologies for this late reply (Been superbusy with school and internship assignments)
Secondly, and that is why I only use magisk. Because once you mess with the host file, depending on what module you install, it can range from tripping safetynet to bootlooping.
So quick question, is it still in this state right now since 9 days ago?
Greetings,
Kevin
+)KEV1N(+ said:
Here's a link to Shakalaca's recovery images.
In the Old folder you'll find MM stock recoveries.
https://mega.nz/#F!p90wgAaY!l1JbJilmAUEKTKWu43pT9w!I89QgZpK
Flash 11.40.86.75 recovery
Boot into recovery
Flash 11.40.86.75 stock rom via adb (it'll take a while)
Once it's done, boot into Android.
Download your respective region's latest MM rom.
Send it to your micro sd.
Install it once Android detects the update file.
(It won't work with custom recovery. I tried every recovery Shakalaca has and only those two seem to work)
Once on the latest MM rom install any nougat patch update you wish to apply, because once you have a nougat rom, you can't boot stock recovery. (As far as my testings went)
So if I were you, I'd go for any update after the zenui 4.0 update since it's a bit better looking imo.
After that final update you can flash TWRP to root your phone. I prefer using magisk, since it doesn't modify the system files.
All you need to do is flash magisk and that's it. No need for SuperSU or anything else. And by any means, do NOT wipe your cache partition once you flash TWRP, otherwise you'll get stuck on the Asus logo during boot.
If you wish to retain the "certified" status in google play store's device certification, do NOT go into the play store before installing magisk. Also, don't delete play store data, otherwise you'll lose your previous purchases.
This post was longer than I initially thought it'd be, but I guess this sums it up pretty well.
Good luck
Click to expand...
Click to collapse
I made a mistake and could not install recovery stock, I followed what you wrote in the beginning install MM recovery and so I did a hard reset and I was able to install the most current recovery stock and installed ROM Oreo, Thanks. Sorry, I'm on google translator.

Downgrade/Rollback OOS

Background
I've been doing some testing of installing OTAs (incremental and full) using a test version of TWRP. But, since I keep my phone on the latest version, I needed to firstly rollback to an earlier version so that i could then test upgrading.
Since the only ways I knew of doing this successfully was to use the MSM Tool or the rollback files that were made available during the initial testing of OOS 12, I chose the rollback file.
I then needed to upgrade the phone to get to the correct version for the incremental OTA I wanted to install by updating using a full zip file. Only then could I test installing the incremental OTA.
What didn't work
The above process is rather long and messy (multiple updates to get to the starting point).
I tried installing the full version of my starting point using Local install, but the phone wouldn't boot properly, nor could I swap slots and revert back to the previous version. I ended up having to use the MSM Tool to get my phone working again.
I also tried flashing the full starting point version in TWRP and then tried to format data (which is what the OOS downgrade zip does) but TWRP had errors doing the format. I then tried to format data in fastboot using fastboot -w, but that also failed and I had to use MSM again.
What worked
Since the OOS downgrade zip ends up formatting the phone in the OOS recovery I decided to try that.
So, starting from the current latest version on OOS (F.63) I used TWRP to install the full F.62 zip and then rebooted to recovery.
The phone comes up in the OOS recovery and I selected Format.
Success!
After the format the phone rebooted and came up on a clean install of F.62.
Conclusions
It seems that you can roll back easily to any version you want, provided to can install the target version and boot into recovery.
Note that you should also be able to this process using Orange Fox.
I haven't tried doing this using the OOS Local install, nor have I tried reverting back to an OOS 11 or 12 version. And I don't plan to test these because I've got no need to downgrade to OOS 11 or 12.
Would there be any significant difference if formatting FIRST, and than flashing OOS and than perhaps flashing TWRP rebooting into TWRP and than an additional format if possible?
If it doesn't format the second time maybe it will still boot?
I have no idea. I wrote what did and didn't work for me. Feel free to try something different and share your experience.

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