Recovering password on old device

Does anyone have documentation on how to reset an old device (Linksys E900) running 14.07?

The steps on wiki do not help me much, I guess they've changed a lot since then.

Failsafe existed already at 14.07 (and before).

https://openwrt.org/docs/guide-user/troubleshooting/failsafe_and_factory_reset

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