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| Device / firmware | Likely -a | |--------------------------|-------------| | Old F660 / F460 | 1 | | F680 / F609 (2015‑2018) | 2 | | GPON ONT (F670L, F609 v9)| 3 or 4 | | Custom ISP firmware | try 1→5 |

ztecfg.exe -d -i config.bin -o config.xml -a 1 If it fails, try:

Ztecfg.exe May 2026

ztecfg.exe -d -i config.bin -o config.xml -a 1 If it fails, try: ztecfg.exe

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