Flashing TWRP to recovery backup partition - LG G5 Questions & Answers

Hello everybody,
I'm wondering about the possibility of flashing TWRP not just in the recovery partition, but also to the recovery backup partition. As sometimes (like when dm verity is enabled) the phone may overwrite TWRP with stock recovery, there's an high risk of erasing the whole memory when you try to boot TWRP. I think it could be useful to have TWRP in both partitions. Even in the case something in TWRP doesn't work (never happened to me, but it's a possibility), and we don't have the original recovery, we could still use fastboot to flash the stock recovery.
Does it make sense or am I somehow wrong? If it's possible, can it be done by just making a TWRP flashable zip, editing the updater-script file to make it flash the recovery in the backup partition?

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tremalnaik said:
Hello everybody,
I'm wondering about the possibility of flashing TWRP not just in the recovery partition, but also to the recovery backup partition. As sometimes (like when dm verity is enabled) the phone may overwrite TWRP with stock recovery, with the high risk of erasing the whole memory, I think it could be useful to have TWRP in both partitions. Even in the case something in TWRP doesn't work (never happened to me, but it's a possibility), and we don't have the original recovery, we could still use fastboot to flash the stock recovery.
Does it make sense or am I somehow wrong? If it's possible, can it be done by just using the TWRP flashable zip, editing the update-script file to make it flash the recovery in the backup partition?
Click to expand...
Click to collapse
I don't think there is a recovery backup partition.

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Here it is:
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If it wasn't there, how could the phone be able to restore the stock recovery by itself?

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tremalnaik said:
Here it is:
If it wasn't there, how could the phone be able to restore the stock recovery by itself?
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Well, if that was a backup recovery, then it should work to dd TWRP there.
I was always under the impression that the stock recovery was stored in the boot image somewhere.

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I've prepared this script for flashing: considering it's the first time I mess up the updater-script for such an essential part of the system, can you confirm if it is correct, considering I'd put the TWRP image in the zip as recovery/recoverybak.img ?
Code:
ui_print("Flashing TWRP to recovery backup H850");
package_extract_dir("recovery", "/tmp");
set_perm_recursive(0, 0, 0777, 0777, "/tmp");
ui_print("Verifying ZIP contents...");
ui_print(" ");
apply_patch_check("/tmp/recoverybak.img", "9edc062fc9483652a9c57d185447a92a36d0f603") || abort("\"/tmp/recoverybak.img\" has failed verification.");
ui_print("Flashing. this might take a bit...");
ui_print(" ");
package_extract_file("recovery/recoverybak.img", "/dev/block/bootdevice/by-name/recoverybak");
ui_print(" ");
ui_print(" ");
ui_print(" ");
ui_print(" Finished... ");
ui_print(" ");
ui_print("Zip by Tremal Naik");
ui_print("Template by autoprime - thx");
ui_print(" ");
i've also checked that both recovery partition and recoverybak partition are the same size, about 41MB, so twrp should fit.
Flashing with dd, according to the TWRP website can be done with
Code:
su
dd if=/sdcard/twrp.img of=/dev/block/platform/soc/624000.ufshc/by-name/recovery
so replacing "recovery" with "recoverybak" should do the job.

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tremalnaik said:
I've prepared this script for flashing: considering it's the first time I mess up the updater-script for such an essential part of the system, can you confirm if it is correct, considering I'd put the TWRP image in the zip as recovery/recoverybak.img ?
i've also checked that both recovery partition and recoverybak partition are the same size, about 41MB, so twrp should fit.
Flashing with dd, according to the TWRP website can be done with
so replacing "recovery" with "recoverybak" should do the job.
Click to expand...
Click to collapse
Sorry, looks like you are more knowledgeable on the subject as I don't even know what all that code means. :crying: Any other people know?
The bottom one should work as far as I can tell. If it doesn't, it should throw an error.