Devices using Garmin's customised Android fw aren't so easy to manipulate as the ones running their usual proprietary fw.

Does your device still have the original factory-loaded version or has it had one named as V9.00 installed previously?

GE may have determined that the latest fw is already installed, so please state exactly what are you wanting to achieve or correct by loading/reloading fw.

The file on Garmin's server is unlikely to be corrupt and anyway WebUpdater is not compatible with .update files.

PS: Please don't make consecutive posts, use the Edit button to add to the immediately previous one instead.