In case of being asked to update a device's bootloader for whatever reason please try to do it via an OS upgrade first, if it's impossible for whatever reason please follow the following instructions:
The new keonn-kernel.jar => Ask support@keonn.com for it.
A SCP or FTP client, good examples are:
Filezilla
WinSCP
All linux machines come with scp command installed
If you already use PuTTy, check your putty installation for pscp or psftp commands
Delete all copies of keonn-kernel.jar in the target device. Possible locations include:
/home/keonn/kernel/lib folder
/home/keonn/kernel/module/app.AdvanNet/lib/
/home/keonn/kernel/module/app.AdvanNet/alternatives/[xxx]/lib/
Upload the provided jar to the target device's /home/keonn/kernel/lib folder