panel, you may see a "No Signal" or distorted image. Always verify your panel model number on a site like PanelLook before choosing a firmware.
Rr52c.03a Firmware Download: Official Guide & Update Instructions
Always use the official Amcrest support portal. If you cannot find Rr52c.03a there, contact their technical support directly for the file rather than risking a third-party download site.
Before updating your device's firmware:
Power on the board. The indicator light (LED) should start flashing rapidly (usually red and blue). Do not turn off the power during this time.