Thought I would pass along this information to the community.
I have a 2CD2532F-IS with firmware 5.30_150513 dated 07/2015. My Aliexpress seller unfortunately did not update the firmware/MTD prior to sending it to me so I had a Chinese unit on my hands. I downgraded to 5.2.5 and the cam was still in Chinese. The Hiktools fimrware mod did not work, so I knew I had to do the MTD hack. The MTD changes were a little beyond my comfort zone and I reached out to the seller for help. Surprisingly, the seller and I were able to get on a remote connection together and they changed my MTD settings remotely. After all was said and done, I had an English language camera running 5.2.5.
Here are the values that they changed:
mtd5
00000650, Column 04, 02 > 01
00000670, Column 0B, 90 > 91
mtd6
00000010, Column 00, 02 > 01
00000030, Column 07, 90 > 91
Hope this helps!