Ninebot ESX Error Code 49

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Error 49 on a Ninebot ESX.
"Built-in battery firmware is outdated. Please update to the latest version."

Cause

Error 49 is thrown when the ESC has updated firmware but the BMS is on a version < 1.3.0.

Fix

Download a newer BMS firmware version from Ninebot ESX BMS Firmware and flash to both the internal and external battery.

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