I have ctek skyrouter z4400 and I'm wondering if it may be possible to attempt to install openwrt on it?
the wiki does not specifically mention the 9625.
It has a at91 sam 9625 processor 128MB DDR2 RAM 256MB SLC NAND Flash.
It has a microsd slot that auto boots firmware updates so it should be easy to recover.
currently it runs a custom linux 3.16 running ctekOS (that is available to developers)
It has an onboard uart so it should be easy enough to pull the partition layouts etc from Uboot.
Ctek Wireless and Automation Solutions :: 3G Wireless Controller (ctekproducts.com)