[Q] XPERIA M with Android 4.3 (15.4.A.1.9) and Link2SD (3.7.3) - only FAT32 ? topic

Problem: Link2SD can not link partitions with EXT2/EXT3/EXT4-Filesystem, only FAT32.

Recently I updated my XPERIA M (C1905) with Sonys PC Companion from Android 4.1.2 to 4.3 (15.4.A.1.9).
I lost root, and Link2SD didn't work.
* Towelroot-v3 gave me (half) root again.
* I installed BusyBox Free 2.5 (v 1.23.0) and SuperSU Pro 2.40 with chainfires SUPERSU-binary 2.40
* I applied remountrebootfix for 4.3 (2014-06-18, install.bat) to get full root.
* I applied term-init.sh to get init.d-support (seems to be not present in Sonys Android 4.3 / 15.4.A.1.9).
RootValidator says, that I have root. Uni-init says, that I have init.d-Support.

I formatted the (new) external SD-Card (64GB) with Minitool Partition Wizard: First primary partition (57GB), second primary Partition (1.99GB). First I tried EXT2/EXT3/EXT4 - all these attempts fail. The only solution was to format both partitions as FAT32 - doing so everything went well with Link2SD.

My questions:
* Does XPERIA M with Build 15.4.A.1.9 support EXT2/EXT3/EXT4 filesystem on the external SD-Card (first partition) at all?
* Does Link2SD (v. 3.7.3, with Link2SD Plus 1.0.6) support mounting the second partition as EXT2/EXT3/EXT4 on XPERIA M?

Thanks in advance for your help!
Michael