Pixhawk 4 Mini arming switch

Hello, I have just purchased and installed a Holybro Pixhawk 4 in a fixed wing application. I am using the latest stable FW. At first, the servo outputs would not work, and the Pixhawk GPS module arming switch and LED indications didn’t work. After downloading the developer FW, everything worked. However, not familiar with what could go wrong with the developer firmware, I reinstalled the stable version of firmware. Now the servo outputs continued working, but the GPS module arming switch or LEDs don’t work. I have to arm with my throttle stick. In addition, the pixhawk will arm at any time…no GPS lock at all. I am suspicious of the stable firmware.
Any thoughts would be great. Thanks…Rudy