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If the web interface is stuck in a boot loop:

A common mistake is downloading any file that matches the "RSAG7.820" motherboard text.

D. Command-line / vendor tool

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The following steps are standard for "forcing" a software update on RSAG7.820 boards: Preparation : Download the correct firmware and extract the file to the root directory of a formatted, empty USB drive. Connection

The firmware must match your specific TV model, board revision, and screen panel type. Installing the wrong software can permanently break ("brick") your TV.

: You can visit the Hisense USA Support page and enter your serial number to find the correct file. If the web interface is stuck in a

Try a smaller USB drive (2GB or 4GB work best). Ensure the file is not inside any subfolders.

: Official over-the-air (OTA) updates are recommended for safety. However, for older models or those stuck in boot loops, manual USB installation is often the only path, though it carries a high risk of permanently bricking the set if the wrong version is used.

Ensure you are downloading the correct format for your repair strategy: 820.4680 CHASSIS SCH Service Manual download

Once the firmware is installed, it is highly recommended to enter the service menu to ensure the panel settings are correctly configured for your TV, preventing backlighting or color issues.

Format the drive to FAT32 . Partition styles must be MBR (Master Boot Record), not GPT.