[SOLVED] Upgrading to 0.7.0 then downgrading to 0.6.1 breaks bootloader funcitonality

Firmware
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This might be helpful as well:

Upgrade Chart - Photon/P1

  • You should be able to upgrade any 0.4.6 or later directly to any version for Photon/P1.

There is one important caveat, however: If you are upgrading from a version prior to 0.7.0 to 0.7.0 or later, on the Photon/P1 the device must have cloud access unless you flash the bootloader manually.

The reason is that 0.7.0 requires a bootloader upgrade. In versions prior to 0.7.0 the bootloader was embedded in the system firmware parts, but there wasn’t enough room in 0.7.0 to do that.

If you’re upgrading OTA (including safe mode healer), you’ll notice four reboots or more, for user part, for system part 1, system part 2, and bootloader.

The problem occurs if you upgrade by USB DFU (particle update). You’ll get system part 1 and system part 2, but not the bootloader, because the bootloader cannot be updated using DFU.

It should be updated by safe mode healer, unless you have a device that is not configured for Wi-Fi, then you should manually flash the bootloader in serial mode or JTAG/SWD.

Downgrade Chart - Photon/P1

  • Any version 0.7.0 or later to 0.6.x, you must downgrade to 0.6.3 first. (Reason: only this version downgrades the bootloader.) After you downgrade to 0.6.3 you can downgrade further if necessary. OTA you must flash part2, then part 1.

  • Any version 0.7.0 or later to 0.5.x, you must downgrade to 0.5.5 first. (Reason: only this version downgrades the bootloader.) After you downgrade to 0.5.5 you can downgrade further if necessary. OTA you must flash part2, then part 1.

Upgrade Chart - Electron

Any version prior to 0.5.3, including the old factory default of 0.4.8, you must upgrade to 0.5.3, 0.5.4, or 0.5.5 before upgrading to any higher version. (Reason: support for 3 system parts.)

Downgrade Chart - Electron

  • Any version 0.7.0 or later to 0.6.x, you must downgrade to 0.6.4 first. (Reason: only this version downgrades the bootloader.) After you downgrade to 0.6.4 you can downgrade further if necessary. OTA you must flash part3, part2, then part 1.

  • Any version 0.7.0 or later to 0.5.x, you must downgrade to 0.5.5 first. (Reason: only this version downgrades the bootloader, and downgrade to 2 system parts). OTA you must flash part 2, then part 1.

  • 0.6.x to 0.5.2 or earlier: You must downgrade to 0.5.3, 0.5.4, or 0.5.5 first. (Reason: downgrade to 2 system parts). OTA you must flash part2, then part 1.