I recently downgraded my firmware using telnet from 3.xx to 2.3 but lost access to telnet because of same, methods of getting telnet pwd for that version has been removed from jfc group's github, nothing on way back too.
Low-level control toolkit for JF ONT (root access, TR-069 removal, firmware downgrade, scripts) Includes firmware files for downgrade and recovery, organized by model. - Naitik1208/JF-R...
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