I understand now i''am still woundering to flash my device with openWRT i hope to have gui but this says i may not have it
Devices with 4 MByte or less Flash memory can install OpenWrt as well, but with a limited feature set. They cannot use optional packages and in some cases may also not have a web GUI, due to limited flash space and may therefore have to stick to command line administration only. The creation of individual custom packages may help to avoid some of these limitations on such 'small' devices, but such a custom-package-creation is not part of this howto.
Your device is too limited in its resources to do much more than the simplest of routing and wireless. Even if you could get the firmware installed for a VPN, it will likely crash.
From the above link
32 MB can work for minimal router/AP functions, but may repeatedly “crash”, depending on your hardware and use case
In the time it takes you to discover this yourself, if anyone could ever get that far, you could have a new router that has reasonable resources for ongoing use for around US$20, some of which already come with "close to the tree" OpenWrt and VPN firmware and GUI installed. Many opinions and recommendations in the long thread
What can i do i dont wanna use the stock firmware
And still offers me alot more functions and stuff i checked the latest ddwrt firmware and its dd-wrt.v24-37305_NEWD-2_K2.6_mini-e1200v1 based on Kernel 2.6 too for E1200 v1 router.
Spend on the order of US$20 and buy a current router with at least 16 MB of flash and 128 MB of RAM.
It's had a good 8 year run since its 2011 release, but devices of its capabilities are, as you're finding out, Difficult, at best, to securely use today. Even with all those "features" and, in my opinion, unwisely ignoring the security problems, the slow CPU and limited RAM is likely going to be the limit on usability and stability of the device.