Tried updating bootloader, Pixhawk now detected as LegacyFMU and won't connect

[joy123 (Joydeep Bhowmik)]

I got a solution here:

How to enter DFU mode on Pixhawk

I was going through the discussions to update the bootloader to from 4 to 5. If you are using pixhawk with 2.4.8 which as 2 mb flash but cant upload v3 firmware due to bootloader version 4, here is what worked for me: Download any fmuv3 firmware with bootloader which must be less than 1mb if you are using fmuv2. I downloaded ardusub firmware with bootloader. Open mission planner and select custom firmware. select board type fmuv3 and flash this firmware. Reboot and connect by mavlink. Go to inst…