TBeam "invalid header: 0xffffffff"

[lycaon42]

I decided to get an old TBeam v1.1 back up and running recently and ran into some issues.
The board turned on and the leds seemed to behave normally, but it would not come up on any Bluetooth device list.
I first tried restarting the board, reflashing, and erasing and reflashing all to no result.
I did some research and found someone that had a similar issue with an esp32 that resolved it by running "esptool.py --baud 921600 erase_flash", then "esptool.py --baud 921600 write_flash 0x1000 system-info.bin", and then reflashing.
I ran the first command which ran successfully, but the second command for writing the bootloader failed because the file name was not correct. Now when I reflashed to 2.5.8, the serial log read:
"rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT) invalid header: 0xffffffff
invalid header: 0xffffffff
invalid header: 0xffffffff
invalid header: 0xffffffff
invalid header: 0xffffffff
invalid header: 0xffffffff"
(This repeats)

How can I rewrite the bootloader to resolve this?
Some suggestions I found used ExpressIf software that I can't use because I am on a Mac book.
Any help is appreciated!