Hello Experts,
I am beginner with openwrt. I have bought Teltonika RUTX50 openwrt. I don't know how to flash it with ubi file. Is anyone who can help me? Thanks in advance.
searching the forum for RUTX50 would have given you the same answer, next time, use it.
Hi frollic,
Thank you for your reply. But I found the link you send to me is using .bin file to flash rutx50. But I only can download the .ubi file from openwrt web. Where can I find openwrt-factory.bin. Because it's the first time flash for rutx50. Thanks.
it's only an extension, feel free to rename the file, if it makes you feel better 
Ok, thanks. I will try, if I failed , is there any way to make the RUTX50 work as before?
serial, probably.
Got it. Frollic, thank you so much. I will start to flash for RUTX50.
thanks, I will try it again.
root@RUTX50:/dev# ubiformat /dev/mtd16 -y -f /tmp/openwrt-factory.bin
ubiformat: mtd16 (nand), size 134217728 bytes (128.0 MiB), 1024 eraseblocks of 131072 bytes (128.0 KiB), min. I/O size 2048 bytes
libscan: scanning eraseblock 1023 -- 100 % complete
ubiformat: 1024 eraseblocks have valid erase counter, mean value is 3
ubiformat: error!: file "/tmp/openwrt-factory.bin" (size 8284749 bytes) is not multiple of eraseblock size (131072 bytes)
error 0 (No error information)
root@RUTX50:/dev#
It give above error information. Would you please give me some advice how I can resolve it? thanks.
Which image did you try to flash?
Use the </> button next time you post cli output.
So, then why are you going to flash the sysupgrade file instead of the factory file above it?
Because I make a mistake, I thought the file must have .bin extension, the three image only sysupgrade has .bin extension file. that's why I download the sysupgrade file. Now I know, I should download factory file . And every step is in the right status. Thank you very much!
After rebooting , there is no WIFI siginal. What should I do next time? 
Wifi is disabled by default in Openwrt, enable it.
By default, WiFi is disabled on OpenWrt.
Go to Network -> Wireless and set up your WiFi to your own taste.
Hi frollic,
I have used wired cable to connect the lan port and get the ip address and also ssh to rutx50. I think I know what should I do next step. Thank you for your help.
Always a good source of knowledge:
The OpenWrt starters guide.
OK, I will check. Thanks.
You were told an extension is just that, an extension, and the git link clearly says factory image.