Dashboard and side bar unusable.

Hi David,

Unfortunately no, you would not be able to use a phone to download the OSU files to then force a system update to your console. You would need a USB storage device that meets the requirements listed on the support tool posted by Flymonkey102 in order to
do the OSU.

If you haven't done so, go ahead and do a hard restart and power
cycle to the console. Hold down the power button on the console for about 10 seconds until it shuts down and then remove the power cable from the Xbox and the power outlet for about 5 minutes. Then re-connect and wait 60 seconds before turning on
the Xbox.

If the issue continues, please try to boot up the console to the Xbox Startup Troubleshooter screen listed on the same support tool referenced above. If the Troubleshooter screen appears, select Reset this Xbox and continue to factory reset your Xbox.
If you cannot get that screen to appear to reset your Xbox to factory defaults, then the offline system update would be your only choice before having to get a new Xbox or send in yours for repair if still under warranty.

No because of how the flash drive needs formatted.

They can't clear the cache because their guide and dashboard isn't loading.

OP I would try an offline system update. Perhaps yours is corrupted somehow?

https://support.xbox.com/en-US/xbox-one/console/system-updates-solution

So i got a flash drive and downloaded the link and the update screen is stuck at 76% applying and 90% downloaded your thoughts?

No visible damage, and it sounds pretty normal ,and i held down the power button for 10 seconds and turned it back on to have the load up happen then back to gray