I had a problem with my THL W200s (MT6592) and I had to format the whole flash and so I lost the contents of NVRAM. I know that the latest version of MTK Droid Tools can restore NVRAM but only with a backup that unfortunately I haven't. I tried IMEI&SN writer, SN station tool, and MAUI META 3G, but neither of them seems working. What should I do? Is there a possibilty of a newer version of IMEI&SN writer, SN station tool or MAUI that will support MT6592?
I recommend sending a private message to Miljenko. He has the same device as you have and he is also a good developer.
Oh and also search on xda for thl w200s. You will find a dedicated thread and you can ask your question there, you will get help.
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