Attempting Firmware Access to Calix GigaSpire Blast GS4220E

Last Modified: Wed, 15 Oct 2025 23:19:57 +0000 ; Created: Tue, 14 Oct 2025 00:02:06 +0000

I was unsuccessful at getting a TTL Serial USB UART to show the console during boot. It may be disabled or the PINs may be for JTAG instead. I did get a working GND + VCC (3.3V).

Removal of the bottom required 3 screws (under the rubber feet) and pushing some plastic clips in. I was able to do so without any plastic clips breaking.