@hexor: The jnhuamao website only provides an update-file. It's not a firmwaredump you might use to change from CC41-A (or maybe AT-09) to HM-10. For this purpose you need a working dump for your IC (i.e. cc2541).
With my firmware dump I was able to convert my CC41-A to an working HM-10. I even could use the update on the jnhuamao-website to update my converted module.
Feel free to send me your mailaddress by pn to receive the dump by email.
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