To update CPLD firmware you need USB Blaster (about ~5$ on ali) and Quartus Programmer software (full Quartus distribution isn't required).
Step-by-step manual:
0. Connect USB blaster to PC, install drivers if needed;
1. Connect USB blaster to JTAG header on Sizif board;
2. Power on Sizif;
3. Run Quartus Programmer;
4. Press "Auto Detect" button, EPM1270 should appears in window;
5. Double click on "<none>" entry in window, choose firmware file (cpld.rev.X.pof at
github)
6. Check "Program" and "Verify" checkboxes;
7. Press "Start" button;
8. Wait for "100% Successfull";
9. Done

