I re-flashed Amcrest_IPC-HX5X3X-Rhea_Eng_NP_Stream3_AMCREST_V2.622.00AC000.0.R.200320.bin just in case i still needed to RMA as i wasnt sure the above would work. (This is what i upgraded it to initially and was working before the powering off)
Once it powered up and was working again i then...