Cable modems were easy: all you needed to do was JTAG them. I don't think any glitching was required. The approach used for the Starlink terminal is more like

Cable modems were easy: all you needed to do was JTAG them. I don't think any glitching was required. The approach used for the Starlink terminal is more like what was done to reprogram satellite TV smart cards. Get a copy of the ROM, count the processor cycles and find the operation you don't want happens and mess with the voltage or frequency at that point to let you send in unsigned/unauthorized updates.