Hi to ya all, although I'm new here I'm not a newbe.
I'm well trained in the partitioning/linux/android/system/flashing business so I won't be asking obvious questions. About a month ago I unbricked a completely bricked (no boot, no recovery, no charging, no nothing) MySaga C3, did imei and mac changes, well all the lovely stuff we're here for
Here's a little info about my ebr mod.
I have a brand new tengda/star Z2 which is a very nice phone with only one problem: app space is just 1GB. Internal SD is about 6GB (the phone has 2GB/8GB specs) so enough to do some repartitioning.
First a made sure droidtool and flashtool worked flawlessly as this is only way to recover if this really go wrong.
Made a complete stock rom backup, nvram the whole shabang, did the same through readback with ft and made a another backup with the stock backup app and a full titanium backup. This all has become a sort standard work-practice due to earlier experiences.
I had the phone rooted from day 1, with supersu and busybox.
Checked the EBR's created by dt, both 512 bytes and thus decided to use Bur's EBR tweak on them. Choose 4GB for data which would leave me with about 2GB for internal sd. EBR's were created, I checked them for any strange stuff, seemed ok. So I flashed them with FT, I already had the cwm recovery flashed, so did the factory restore, reboot and the phone formatted the internal sd straight away.
Results were 3.9GB of data partition and 2.3 of internal sd, restored the apps and data (I used link2sd before all this and it picked up all apps that were in the 2nd partiton of the external sd) and everything was again in its place.
All in all it has cost me about 2-3 hours, mostly because of the extensive backups and verifications, the process itself takes about 6 min.
I had read about the meteos repartition app, but a lot of posts reflected problems so I didn't think it would be a good idea to use. I always trust my own instincts more, probably because of my 40 years of experience in the computer world, and since my Z2 now has this lovely 4GB of space to install my apps, I think I did the right thing.
Thanks to those who posted detailed information about the EBR structure, that helped a lot to make the right decision.