[Android Q&A, Help & Troubleshooting] HBKDXHHH:
Hi guys, first of all, I have to thank each and every one of those who make up this community for helping us in a lot of things and aspects in which the problems for countless devices have already been solved, without your help and dissemination in this forum, we would all be paying to fix the device without doing it ourselves, you make us good technicians in smartphones. :RE

I will start from where it all started, at first they brought me a j7 NEO model SM-J701M with pda already updated: J701MUBU7CSG1, until there everything well, they asked me to install root, I said yes, since they tried but could not, until there everything normal, I've already rooted several smartphones of that model, so for me it would be a piece of cake (I didn't even know what I expected), at the beginning I flashed it with an original rom, the newest one (since I never let myself go back even being in USB debugging and in activated oem), so everything fine until there, the cell phone was already android 9, when I tried to install the TWRP, I sent a message in download mode, the famous error [Only Official Released Binaries Are Allowed To be Flashed], well I look for solutions and nothing works, I enter the recovery mode and the blue screen comes up with the message of: Installing updates, and giving error there is no command (I always get that message when I enter the recovery mode) now well, I can enter in recover mode and the download mode without problems, but the only inconvenience is that in recovery mode I get some messages that I will leave until the end, I want to clarify what I have already tried.

1.- Degrade the operating system (I get an error when trying even with original roms).

2.- Install a TWRP (message from: Only Official Released Binaries Are Allowed To be Flashed).

3.- Revoke the RMM, (the way they tell me to revoke the RMM, it asks me not to set the date and update it after flashing it, but when I activate the Wi-Fi, even deactivating the option of "automatic time on the network ", it changes to the current date, and even on the current date when I give it to update, I get a message that says, error when registering the device, all this in the smartphone settings menu).

4.- Unlock the bootloader, (When I enter the recovery and give it the option, Reboot to bootloader, it sends me to the download mode but without being able to do anything in download mode, forcing me to remove the battery and restart it)

That's all I've tried, now, I leave the messages that appear in the recovery mode of which, is the recovery of the smartphone and lets me use several options, such as wipe data / factory reset, wipe cache partition, apply update from SD card, and some more.

Until there everything I tried, now I leave the record that appears every time I enter the recovery (it should be clarified that the cell phone works in perfect condition and works absolutely everything, the recovery I try to install is the same as used in phones with the same model J7 NEO.)

#fail to open revoery_cause (No such file or directory) #

#Reboot Recovery Cause is [UNKNOWN] #No Support SINGLE-SKU

File-Based OTA

Supported API: 3

E: unknown Volume for path [/ odm]

E: unknown Volume for path [/ vendor]

E: unknown Volume for path [/ odm]

E: unknown Volume for path [vendor]

# MANUAL MODE V1.0.0 #

E: Failed to clear BCB message: failed to find / misc partition.

(and when I exit recovery mode with the option of power off or reboot system now)

finalizing dm-verity hash tree.

Successfully generated dm-verity hash tree.

Shutting down ...

E: Failed to clear BCB message: failed to find / misc partition.

and well in advance thank you for taking the time to read all this, the truth has been a few days with this but I find no solution to make it root that is not through TWRP, and a great apology if I do not understand very well, do it to me I know, I don't know how to speak a lot in English, just something basic, so use the google translator to create this post.

THANKS AND HAPPY HOLIDAYS AND HAPPY NEW YEAR TO ALL. :dedos cruzados: :RE