Some DSC (stability/traction control) variants can engage a little early in RWD mode on some road surfaces. This can often be corrected by adjusting the tyre pressure in the front/rear tyres by 0.2 - 0.3 bar.
If this does not help, simply switch your DSC completely OFF in xDrive OFF mode.
I cannot use the Google / Facebook login.
If you do not see all the login methods available on your device, please ensure that you are not using any type of content or add-blockers such as Pi-hole, 1Blocker or Blockbear.
These can be used on the device you want to flash with, or on the home network your device is connected to. Blockers like these can block things like Google or Facebook domains, which are needed if you want to use them as a login method with xDelete.