The problem seems to be fixed # opkg install kmod-nls-cp1251 # umount /mnt/sda1 # mount -o codepage=1251,iocharset=utf-8 /dev/sda1 /mnt/sda1 root@Omega-3079:/# ls -l /mnt/sda1 -rwxr-xr-x 1 root root 48128 Jan 1 2000 1.BMP -rwxr-xr-x 1 root root 3659904 Jul 26 2003 Boyarskiy-dressirovshik.mp3 drwxr-xr-x 2 root root 4096 Jun 13 09:16 Dir1 drwxr-xr-x 2 root root 4096 May 15 18:03 System Volume Information -rwxr-xr-x 1 root root 3448960 Jan 22 19:30 Vis - Песня_про_нечисть.mp3 -rwxr-xr-x 1 root root 231080 Nov 17 2020 angelsmal.bmp drwxr-xr-x 2 root root 4096 Jun 13 09:16 asdf -rwxr-xr-x 1 root root 9699509 Jun 5 07:49 omega2.bin -rwxr-xr-x 1 root root 205406 Mar 7 2020 pacan_mini_layers.psd -rwxr-xr-x 1 root root 165623 Jan 28 15:03 tela_tst.psd -rwxr-xr-x 1 root root 6912054 Oct 24 2020 winpe.bmp drwxr-xr-x 2 root root 4096 Jun 13 09:16 В_Цой drwxr-xr-x 2 root root 4096 Jun 13 09:16 Кричевский drwxr-xr-x 0 root root 39576966 Apr 24 2020 женщина.bmp No errors occured.