Hey does that factory offline reset update with the osu1

Yes:

I have tried using multiple connections, wired and wireless. I have tried the full factory reset. I have applied offline updates using a USB with the OSU1 contents.

"Done all trouble shooting, reset Xbox, updated firmware offline same problem"

If your console is enrolled in a Insiders preview OS you cannot use OSU1 (offline system update) to recover the console from E206 error.

Factory refresh the console keeping games and apps.

If you are NOT in a Insiders preview and want to attempt an offline system update, make sure you disconnect your wired ethernet connection before starting OSU1.

Personally I wouldn't bother with offline update and go straight to Factory refresh deleting everything if keeping games and apps fails to reset the console.

After factory refresh, reconnecting your console to your network should start a system update download to the latest OS available.

See also ....Whats new system updates in the Hardware section of Xbox support articles and /or search for E206 on that site.

I have xbox one. The update was stuck at 50% for two hours..this is not normal i think. I boot in troubleshooting screen, and nothing works, offline updates with usb stick OSU1/ OSU2, factory reset, and nothing works.....i try everything.

Simialar here, the same update stops everytime downloading. Already tried offline update with OSU1, OSU2 and also complete factory reset, but everytime after reset "it's update time" and you can't even skip it.

Please send me a new XBOX, because a repair with costs for +250€ is just nuts seriously?

Update: I've concluded the hard drive is probably bad. After many hours, I have been able to get to the Troubleshooter and have tried to do factory resets as well as offline updates of OSU1 and factory reset. The soft factory reset has just come back
with other error codes as have the offline updates. Sometimes the offline updates successfully complete but come back with error codes (ex. 200 and 103). The offline updates often get to a point where each additional % of progress is very very slow. You can
hear the hard drive working hard when that happens. The error codes seem to indicate failure of offline updates. So I have given up. Luckily I realized my 1 year warranty was not up yet so I will be sending the unit back for warranty repair.