To update the firmware on your handheld projector, the most reliable method is through the official JMGO Support Center
If a new version is available, tap download. If you see a "No new firmware found!" notification, your device is running the latest software. Step 2: Update Manually (Local USB Upgrade)
: Ensure the projector remains connected to power throughout the entire process. Interrupting a firmware update can permanently damage the device. Automatic Restart
Once you have downloaded the firmware file from the link provided by support, you can proceed with a manual USB installation. Prerequisites
We recommend this way to download app, because it has less change to your current Apple ID.
Before you update your location, you must spend your store credit, cancel your subscriptions, and get a payment method for your new country or region.
For more details, please refer this url:
https://support.apple.com/en-us/HT201389