Installing OpenWrt Issue on WE1326-BKC

Does the model sticker behind say WE1326-BKC?
Install sellers firmware and check your memory amount in the device. If there is 256MB then open a dispute on AliExpress and ask for refund as the item you bought says 512MB memory.
If the memory amount is the problem, you should leave info on your feedback so others can figure out also if they received a different device than what they ordered.

That said, there is a zbt we1326 thread discussing this here ZBT WE1326 crashing with 18.06 image you can modify sources and compile a working image.