I just wrote an answer that your key combination didn't worked for me and what exactly I did, but now I see that in your comment was an
![[enter] :nsen:](./images/smilies/nspire/ns_en.png)
But anyway is it correctly what I did or do I have to wait for uninstalling in the ControlX menu?
What I did:
I uninstalled nBoot by pressing
![[Z] :nsz:](./images/smilies/nspire/nsz.png)
![[0] :ns0:](./images/smilies/nspire/ns_0.png)
After this my boot graphics were gone and it booted with a black and white loading screen.
Because it didn't worked for me, since I overlooked the
![[enter] :nsen:](./images/smilies/nspire/ns_en.png)
I overwrote the two boot2 images with boot1.5 which are a much smaller, then I decreases the extended partition size with nsPartMagic and then flashed boot2 again in order to 'push the two small images over the boarder'.