What should I do?
You need telnet and an internal HDD mounted as /media/hdd (or /hdd)
I moved the SystemPlugins & Extensions folders to the internal HDD creating extra space on internal flash.
If you feel safe with telnet, send the below commands respecting upper & lowercase and spaces.
Note that if something goes wrong, you couldn't be able to boot and a re-flash could be necessary.
init 4
mkdir /media/hdd/myspace
mv /usr/lib/enigma2/python/Plugins/Extensions /media/hdd/myspace
mv /usr/lib/enigma2/python/Plugins/SystemPlugins /media/hdd/myspace
ln -sfn /media/hdd/myspace/Extensions /usr/lib/enigma2/python/Plugins/Extensions
ln -sfn /media/hdd/myspace/SystemPlugins /usr/lib/enigma2/python/Plugins/SystemPlugins
init 3
First the myspace folder is created on hdd.
Then, the two folders are moved in "myspace" folder on the hdd and the relevant space will be available on the flash.
Two link files are installed on internal flash instead of the original folders.
You can check the increased flash space with command: df -h
You can also move other folders/files (e.g. site-packages)
This is my trick to extend the flash space.
I've got a SunRay4 with 60MB max flash, running this 85MB enigma2 OpenPli.
Hoping this could help.