Procedure - https://docs.google.com/document/d/1KNw8eC0MXgeGDcA55e2zKDEzIaN3nuqx/edit
Version 3.6.3 firmware file - https://drive.google.com/file/d/1Nn168l6sdzoQwlBNKr0EbnCAmDMbmbN8/view
Version 4.1.0 firmware file - https://drive.google.com/file/d/1kLVrnf99R4SP3nkO3hOCt3yOunnPi_My/view