http://www.romleyuan.com/lec/read?id=225

a Chinese forum。
你可以看看

it's fixed now

@earens
Some info that could help us :
Wich OS on your PC ?
What ubports installer version you use ?
What kind of USB ports you use (2.0 highly recommanded) ?
Is your USB cable a good data enabled one (best would be the one sold with MX4 if still in good shape).

@easton Well done, please mark as solved https://forums.ubports.com/topic/6311/how-to-ask-a-question-and-then-mark-it-as-solved If you use windows again try 15 sec adb from xda developers install system wide and remove any other adb tools first. ADB has a habit of getting lost on windows.

@Keneda Thank you for noticing that it is incorrect (That is a 'beta' feature and require future work). If you find more devices that do not stand behind their statement, please share

There is a link to improving the information on every Device page, so if you are convinced arale is good for anyone, please add words to its review. It would be nicer to have humans write words than data-driven text

@tera
Oups I didn't check the link. Sorry.
I would try to replace the USB module like Keneda suggested and upgrade to Ubuntu Touch by UBports...
Best of luck

@tera ,thanks for your information.
I had sovled by parted tool.
I had resized the cahe and system size.
The device works well.
Many thanks.

Over script post update/flash should look like:arale_sh.png

@keneda Have just moved it. Thanks☺

@Lakotaubp said in Problem upgrading MX4 from OTA15 to ubport:

Well done on both install and persistence. I think the adb connection "path" between the installer and device was getting lost at various points during the process. Still your there now. Enjoy.

When i only had adb installed for "fastboot device", i lost connection each time exactly the same point.
Same when i succeeded having MX4 recognized by UBport by installing ADB for "normal" device, was excited as i though i won, and then, exactly same point, just after entering recovery, bam!, lost connection.
That's what made me think "hey, could there be a "recovery device" too?"...

PS : i'm not the giving up kind, yes 🤨

I was wondering what was going on here:

apt -o Dir::Cache::Archives=/home/phablet/anbox install anbox-ubuntu-touch

On Telegram zubozrout explained that :

"Well all it does if I parse it right is that it downloads the packages to a specified folder instead of the cache folder on the root filesystem (if you pick a folder in your home for instance) and then installs it from there. So it may not help if the rootfs is too full since the installed files end up where they should anyway but it saves a small part needed for the actual download which may allow you to install it."