PRS-T1 Delete my READER parition and cannot create it back...

Hello,

I (I was) a happy owner of a PRS-T1 for a few weeks.
It was rooted with Boroda/Porkupan and Link2SD was working (sort of...).

Then I decided it's was not good enough and wanted to erase everything to make a clean install for Ruport (I was becoming fed up with Link2SD).

I could have wait for the morning to do it but no, I decided that 4AM and a few belgian Trappists were the ideal moment....

Result : I deleted my READER partition with gparted....
My reader boots and "works" but I cannot install anything.
I tried to recreate it (without belgian beers this time) but without any success
And when a partition is effectively created, I cannot write on, eve as root.

Hope somebody has an answer because I renounce.
Thanks for all the help and this great forum.

Mathieu