Hi guys.

Could you suggest how to fix? I have tp-link 841n running - OpenWrt Chaos Calmer 15.05.1 r48532

Unfortunately I don't have direct access to that AP. ~year this AP works without any issue some time ago I've found that AP began to broadcast default SSID - "Open-WRT" I 've lost https access to it because uhttpd is shutdown and cannot be started because of RO file system:
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root@s45s:/home/sam# mount
rootfs on / type rootfs (rw)
/dev/root on /rom type squashfs (ro,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,noatime)
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,noatime)
tmpfs on /tmp type tmpfs (rw,nosuid,nodev,noatime)
/dev/mtdblock3 on /overlay type jffs2 (rw,noatime)
overlayfs:/overlay on / type overlay (ro,noatime,lowerdir=/,upperdir=/overlay/upper,workdir=/overlay/work)
tmpfs on /dev type tmpfs (rw,nosuid,relatime,size=512k,mode=755)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,mode=600)
debugfs on /sys/kernel/debug type debugfs (rw,noatime)
root@s45s:/home/sam#
++++++++++++++++

unlocking rootfs did not help:

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root@s45s:/home/sam# mtd unlock rootfs_data
Unlocking rootfs_data ...
root@s45s:/home/sam#
root@s45s:/home/sam# mount
rootfs on / type rootfs (rw)
/dev/root on /rom type squashfs (ro,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,noatime)
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,noatime)
tmpfs on /tmp type tmpfs (rw,nosuid,nodev,noatime)
/dev/mtdblock3 on /overlay type jffs2 (rw,noatime)
overlayfs:/overlay on / type overlay (ro,noatime,lowerdir=/,upperdir=/overlay/upper,workdir=/overlay/work)
tmpfs on /dev type tmpfs (rw,nosuid,relatime,size=512k,mode=755)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,mode=600)
debugfs on /sys/kernel/debug type debugfs (rw,noatime)
root@s45s:/home/sam#
++++++++++++++++

help?

Thank you.