Problem installing magisk-cant access internal memory from twrp - OnePlus 7T Pro (Regular & McLaren) Q & A

Hi all, I need a little help, I've unlocked bootloader and installed twrp recovery (that's wiped data on the phone and I've reinstalled apps and accounts).
The guide i was following ask to reboot and boot twrp recovery (working) and to install magisk zip file copied from PC to internal memory
I copied magisk in internal memory (root and download folders) but in TWRP I can't see the storage i get from PC, only different folders.
I tried also adb sideload D:\Android\Magisk-v21.2.zip directly from PC but i get errors on mounted file systems yrying to install files i think, I tried to check and mount file systems in TWRP advanced options but I can't mount them ...
How can I install Magisk ?
Thanks for help

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blackalex1 said:
Hi all, I need a little help, I've unlocked bootloader and installed twrp recovery (that's wiped data on the phone and I've reinstalled apps and accounts).
The guide i was following ask to reboot and boot twrp recovery (working) and to install magisk zip file copied from PC to internal memory
I copied magisk in internal memory (root and download folders) but in TWRP I can't see the storage i get from PC, only different folders.
I tried also adb sideload D:\Android\Magisk-v21.2.zip directly from PC but i get errors on mounted file systems yrying to install files i think, I tried to check and mount file systems in TWRP advanced options but I can't mount them ...
How can I install Magisk ?
Thanks for help
Click to expand...
Click to collapse
You must copy files from PC to /temp folder

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FSadino said:
You must copy files from PC to /temp folder
Click to expand...
Click to collapse
I don't have a temp folder, only Alarms, Android, DCIM...., Ringtones and Whatsup folders, should I create it ? Then i can see it in twrp ?
By the way upgraded twrp to 3.4.0.2
Tried to create temp but I can't see It obvously in twrp as the rest of the folders, only mounted filesystem is metadata

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go in twrp to advanced wipe --> format data partition to ext2 --> wait --> when done format back to ext4 --> wait --> now see if your OS recognizes the USB android device. try usb replugging if not --> now you should see a new partion where you can write in your file explorer on HOST OS.

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n3tk1d said:
go in twrp to advanced wipe --> format data partition to ext2 --> wait --> when done format back to ext4 --> wait --> now see if your OS recognizes the USB android device. try usb replugging if not --> now you should see a new partion where you can write in your file explorer on HOST OS.
Click to expand...
Click to collapse
Ok since It is wiping data partition and I'm under mobile connection I'll do this in the next couple of days back home. Just to confirm, I can see internal memory partition from host OS without problems, I can copy files from OS to mobile. The problem is that rebboting in recovery TWRP I can't see FROM MOBILE that partition and folders, so I can't access magisk file I copied ...
With your suggestion do you mean that the new formatted partition is visible both in TWRP and OS ?

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blackalex1 said:
Ok since It is wiping data partition and I'm under mobile connection I'll do this in the next couple of days back home. Just to confirm, I can see internal memory partition from host OS without problems, I can copy files from OS to mobile. The problem is that rebboting in recovery TWRP I can't see FROM MOBILE that partition and folders, so I can't access magisk file I copied ...
With your suggestion do you mean that the new formatted partition is visible both in TWRP and OS ?
Click to expand...
Click to collapse
Which guide are you following?

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Hw4ng3r said:
Which guide are you following?
Click to expand...
Click to collapse
I found many and they are all similar...
- Unlock boot loader
- Install recovery TWRP
- Reboot in recovery (sometimes from phone other guides from image on PC)
- install magisk copied from OS from twrp recovery
Everything is clear except for I can't access the data partition from TWRP in the last step so I can't see the copied magisk file and I can't mount the partitions in TWRP (i get an error)
A couple of guides:
Root OnePlus 7T Pro (hotdog) and Install TWRP Recovery 3.4.0 (androidweblog.com)
Download Latest Magisk zip 21.2 and Magisk Manager 8.0.4 and Root your phone (getdroidtips.com)
In the second one they use the sdcard partition but I don't have sdcard on 7T Pro ...
You can point me to a different method if available to get magisk installed ...
Thanks for the help

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blackalex1 said:
Ok since It is wiping data partition and I'm under mobile connection I'll do this in the next couple of days back home. Just to confirm, I can see internal memory partition from host OS without problems, I can copy files from OS to mobile. The problem is that rebboting in recovery TWRP I can't see FROM MOBILE that partition and folders, so I can't access magisk file I copied ...
With your suggestion do you mean that the new formatted partition is visible both in TWRP and OS ?
Click to expand...
Click to collapse
so when you do as i said you are in twrp cos you booted to it. twrp will read and be able to access your phones storage. you are not wiping the data partion but are formating it to ext2 and then back to ext4 (still do backup as data will be lost). this enables twrp to circumvent the oxygen decryption / format. NOW and only AFTER THAT dont reboot (dont), but now your HOST can copy the desired magisk to the phone that is still in twrp RECOVERY MODE. Thus you can now install it with twrp since twrp can now access and read the recently copied image. anyways i wont do it. i used a patched magisk image. was the only thing that ultimately worked for a clean rooting and it didnt even unlock the /system_boot and /vendor partions but it works. find in the oneplus 7t pro guideds forum topic your corresponding magisk image and flash it to disk with fastboot flash boot magisk-patched.img. that worked pretty well when you use the right android version 10.0.x.etc.
actually, wtf do i know. i just followed this thread:
[Guide] How to Root OnePlus 7T Pro with TWRP
thanks for this detailed root process, I've been looking for this for around 3days. (my OP7t pro is coming today will try this root method)
forum.xda-developers.com

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Clearly stated in the TWRP thread, decrypting OOS is not working. And I wouldn't even bother formating data.
In order to flash zip is TWRP you most execute;
"adb push magisk.zip /cache",
then in TWRP go into that folder and flash the file.
Or you can do patched image method, you can find guides in guides section.
Some basic researching would also help.

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Lossyx said:
Clearly stated in the TWRP thread, decrypting OOS is not working. And I wouldn't even bother formating data.
In order to flash zip is TWRP you most execute;
"adb push magisk.zip /cache",
then in TWRP go into that folder and flash the file.
Or you can do patched image method, you can find guides in guides section.
Some basic researching would also help.
Click to expand...
Click to collapse
PERFECT thank you very much, got only a couple of warnings at the end:
failed to mount /system_root (permission denied)
failed to mount /vendor (permission denied)
But It seems correct.
I will check for patched image to better understand what is tha advantage compared to the standard one.

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blackalex1 said:
PERFECT thank you very much, got only a couple of warnings at the end:
failed to mount /system_root (permission denied)
failed to mount /vendor (permission denied)
But It seems correct.
I will check for patched image to better understand what is tha advantage compared to the standard one.
Click to expand...
Click to collapse
Those errors are nothing to worry about since it's not possible to modify those partitions on stock.

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I tried rooting my lenevo tab M10 hd and flashed a incorrect boot img as I am new to rooting and bricked up my device then from some where I got the correct boot img and recovered my device but now I am unable to use its internal storage , its shows some random letters when I open the file manager can you guys help me out resolving this issue.