Cara Hack Wifi Hotspot Mikrotik Rb750

Hello!
On first I just thought it is kind of impossible bug or exception, but now I already have this problem on 2nd CCR1036. After some power failure and reboot, router says:
ERRO: wrong username or password
Despite these routers have configuration which is not changed for year or so.
First router had 6.39.X version, 2nd has 6.40.5 version. But have same problem - after reboot, no access. I can pig it, it works, but no access. Web access also doesn't work, other access I have switched of on configuration.
First router was reset and replaced with newest SW and work normal again. 2nd is located in remote location, do anyone have idea how to get back access without resetting?
Untuk setting Mikrotik dengan Telkomspeedy sebenarnya sangatlah mudah, pembaca Info Teknologi cukup menyolokkan kabel internet dari modem ke port 1 di mikrotik, setelah itu sambungkan port 2 mikrotik ke switch / hub. Setting akan terdeteksi secara otomatis dan biasanya user / client akan langsung bisa menyambung ke internet tanpa masalah.
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On first I just thought it is kind of impossible bug or exception, but now I already have this problem on 2nd CCR1036. After some power failure and reboot, router says:
ERRO: wrong username or password
Despite these routers have configuration which is not changed for year or so.
First router had 6.39.X version, 2nd has 6.40.5 version. But have same problem - after reboot, no access. I can pig it, it works, but no access. Web access also doesn't work, other access I have switched of on configuration.
First router was reset and replaced with newest SW and work normal again. 2nd is located in remote location, do anyone have idea how to get back access without resetting?