Uploading custom firmware.factory.bin and selecting full erase and flash results in bad flash

[jp-bennett]

While playing around with the slipstreaming stuff, I noticed that uploading a tbeam firmware.factory.bin to the flasher, and doing a full erase and install results in a non-booting device.

The error message coming over serial is invalid header: 0xa8120c42, and those bytes are not consistent between builds. The initial thought is the the ota and ble firmware bits are not fetched by the flasher in this case.