Flash system FW from 0.7.0-rc.3 to 0.6.2 problem / Safemode

[ScruffR]

Have you read this

@BDub

Note about Downgrading [Photon/P1] OTA or YModem transfer: First downgrade system-part2 back to 0.6.2. Any attempts to write to the DCT while the device is in DFU mode will fail now. At this point, attempting to downgrade system-part1 will fail silently, since the new bootloader (v100) cannot access DCT and read module update info, thus, in order to downgrade from 0.7.0-rc.3 to 0.6.2, photon/p1 firmware modules should be flashed in the following order with 0.6.2 system binaries: system-part2 -> bootloader (v0.6.2) -> system-part1.

You can use

particle flash --usb <binary>

for the system parts and for the bootloader

particle flash --serial <bootloader.bin>