Installing - connection to device lost

A Former User

Sorry, but I can't help you any further.

Lakotaubp

@geekyneo All I can think off for now and you might not like it is to flash the OP3 with the OS version it shipped with and go from there. That should put everything back to where it should be. You can then do all the dev mode stuff, mtp transfer usb debugging, adb permissions and try again.
That or try a much older version of the installer with the OP3 on it. Lost as to why it will not flash after clearing, formatting and so on.

RapidRotator

I had the same problem and decided to try and solve it by formatting both /data and /system. TWRP provides buttons to change the filesystem type for any partition, but afaik not to format any partition except /data. So using the UI I changed the filesystem of /data to ext4 and formatted it.

Then I went into a shell ($ adb shell on my PC but TWRP has an internal shell too) and unmounted /system to format it:

~ # mount

Note the block device /system is mounted on, then:

~ # umount /system/
~ # mkfs.ext2 /dev/block/<device>

(Yes, that's ext2, not 4, but it won't matter)

You can of course use the shell to format /data (and /cache) the same way if you want.

After that, I could install UT by not ticking the boxes for first install and wipe device.

I would be interested if others also succeed using this solution.

kriszie

@rapidrotator
This worked for me! I only had to alter the commands, as 'mount' would not show /system and the adb shell did not recognize the mkfs.extX -invocation of mke2fs :

OnePlus3:/ # cat /etc/fstab

Get the block device...

OnePlus3:/ # mke2fs -t ext4 /dev/block/<device>

As the /system-partition was already ext4, I wonder whether wiping the partitions will be enough and the trick is not ticking the 'first install' and 'wipe device' boxes....

Thanks a lot, anyways!

RapidRotator

@kriszie mount without arguments will show anything that is mounted, and where. So if it doesn't show /system than it means that partition isn't mounted, so you don't have to unmount it. Sadly, UT doesn't have lsblk, my usual go-to for finding out what devices there are, mounted or otherwise.

cela

@rapidrotator said in Installing - connection to device lost:

I had the same problem and decided to try and solve it by formatting both /data and /system. TWRP provides buttons to change the filesystem type for any partition, but afaik not to format any partition except /data. So using the UI I changed the filesystem of /data to ext4 and formatted it.

Then I went into a shell ($ adb shell on my PC but TWRP has an internal shell too) and unmounted /system to format it:
~ # mount
Note the block device /system is mounted on, then:
~ # umount /system/
~ # mkfs.ext2 /dev/block/<device>
(Yes, that's ext2, not 4, but it won't matter)

You can of course use the shell to format /data (and /cache) the same way if you want.

After that, I could install UT by not ticking the boxes for first install and wipe device.

I would be interested if others also succeed using this solution.

Isn't there a manual install instruction somewhere?, I thought it was on the devices page, i'd like to try installing
manually, without the installer.
None of these solutions worked me, been messing around for hours, wiped and formatted all partitions except USB-OTG.Even formatted
SYSTEM using twrp terminal, still freezes on reboot, after installing. Even reinstalled Oxygen 9.0.6 using the installer and started over again.
I can install Lineage OS from TWRP no problem.

I can easily install, if I untick first install and wipe boxes, reboots, get the rotating
ring on first boot, then on 2nd reboot stuck on "Powered by Android" splash screen.

using ubports-installer_0.8.6-beta_linux_x86_64.AppImage and twrp-3.3.0-0-oneplus3.img newer versions of both
freeze up.

Moem

@rapidrotator said in Installing - connection to device lost:

I had the same problem and decided to try and solve it by formatting both /data and /system. TWRP provides buttons to change the filesystem type for any partition, but afaik not to format any partition except /data.

This is the problem I seem to be running into today. The installer said something about needing to format both of these partitions, but I could not find where to do it in TWRP so I skipped it. This appears to have been a mistake. The phone can now not boot into any OS. (Not a drama as it was very cheap)

Is there any way to fix this without terminal use? If not, is there any link or information that explains how precisely this is done through the terminal? The instructions as given here make my head spin, I'm afraid.
Any sentence that starts with 'You can use the shell...' makes my inner technophobe shout 'No I &%$ well cannot'.

Lakotaubp

@moem you can just boot back to twrp and you need to look under advanced wipe otptions. Clear format to ext4 cache and data. Then try again. You might need to do system as well.

Moem

This post is deleted!

Moem

@lakotaubp said in Installing - connection to device lost:

under advanced wipe otptions. Clear format to ext4 cache and data. Then try again. You might need to do system as well.

Okay, I managed to do this. But I'm still getting the same error:
Installing - connection to device lost

And it also pops up a notification about not being able to mount something. Here's an example, but the numbers differ a bit:

Moem

The installer offered to reinstall OxygenOS, and that worked! So at least the thing boots again. More experiments to follow soon.

Lakotaubp

@moem Original thread https://forums.ubports.com/topic/3253/oneplus-3-3t/616 very long and a bit of a ramble. Start at about 5th Nov.

Moem

@lakotaubp I don't see anything relevant in that thread... maybe I'm missing something?

Lakotaubp

@moem https://forums.ubports.com/topic/3253/oneplus-3-3t/59 fromm the 5th Nov 2019 is where the first mention of using TWRP starts down to about 19th it might give some hints on how to sort it.

Moem

@lakotaubp Ah, THAT fifth of November! Will check, thank you.

Edit: I see a lot of mentions of using TWRP for wiping cache/data/system partitions... which I have done at least five times today in different ways.
No success yet.

Lakotaubp

@moem Just found this
libremax Just trying to think what I did with twrp. Wipe option, format data-select yes, then in advanced wipe repair change system and data to ext4 then reboot. Then just ran the installer with wipe and bootstrap, booted to fastboot then recovery for the rest. I do remember it took ages for the spinning circles to appear to say it was flashing the device. Remember thinking it had not worked at first. Maybe leave it a little longer rather than force reboot but bit confused I must admit.

But that's about all. Will keep looking

Moem

@lakotaubp said in Installing - connection to device lost:

Then just ran the installer with wipe and bootstrap,

I know about the wipe, but what is the bootstrap?
It does not take long at all to tell me it's flashing. It always fails during the 'pushing files to the device' phase. And I never try to reboot at all... there is, after all, nothing to reboot.

Thank you for your time!

Lakotaubp

@moem It was an option given in the installer is it not there now? Also found this from Flohack

FlohackFlohack 31 Jan 2021, 08:34
@sven Also delete system partition to be sure - If there was encryption used for data before, it needs to be formatted, a simple wipe wont work.

Might not help but explains why.

Moem

@lakotaubp said in Installing - connection to device lost:

It was an option given in the installer is it not there now?

I see two options: First Install (tick if the device was running Android before) and Wipe Data. Dalton advised me to tick them both.

I've wiped all the things.... so many times. And done a factory reset, and reinstalled Oxygen. All partitions show up as Ext4.
I don't by now even remember what I've tried.

Lakotaubp

@moem Sounds like time for a break and come back fresh. Packing in for today soon myself . Good luck and will keep thinking.