@cvp, I think i understand what you mean, but i don't know how to do this.. And still for example, you want to change some icons or system pictures and for seeing your result you still need reboot or refresh..

@bitcool and @accountvip, i really don't understand why it's not work for you.. I tested this a many times and always succeed.
I removed sdk repo and bash, start N9QT and it install sdk repo and bash and after this start N9QT.
Maybe you have some windows opened and maybe something work on the same process that need to be free for installation of program..