The stock manual omits the deep sleep mode. After patching, enable "Deep Sleep" in Power Settings. This cuts standby drain from 15% per day to 2%.
The original manual hides the fact that you need 123456 or 888888 to access the factory menu. The patched manual goes further, explaining the (password 1617 ) that the original document omits entirely.
"Patched" Weierwei VEV-3288S units refer to versions unlocked to operate outside the factory-standard frequency ranges, often enabling extended UHF (e.g., 400-470 MHz or higher) or wider VHF capability