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Does this have an SD card slot? Is there an "Update from SD card" in the list? Do you have PgUp/PgDn buttons on this?
If so, you can put update.zip (the decrypted .upx) on a SD card, boot to recovery, select update from SD card.
If you don't have buttons you can open/close the cover to go down a line. If not, you can plug/unplug the USB to go down a line. Power activates the choice.
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