To have a Teclast C260 emulator o "clone"
... is a great option, but it's risky... I would suggest it to try it just to those that have a backup for the firmware.
As I have succeeded in this i will give some hints to choose a Teclast C260 emulator.
1.- Try to buy a original Teclast
2.- Look if the unbranded manufacturer is promoting its device with the red menus of Teclast, beside of that:
3.- C260 doesn't have a speaker
4.- C260 have a micro
SD slot (one of few Teclast players that have it)
5.- C260 have just two
keys: POWER and ON/OFF, each one on each side.
6.- Thermal buttons (some users get to install and see firmware but key pad doesn't work).
7.- Buttons configuration: M on the top... >|| on bottom
8.- Buttons must show signs (M, >, <) with backlit not just lights
To have a Teclast firmware report more benefit than a normal rockchip firmware, as are constantly upgrading, adding new functions and has a good fansite for support (www.teclasters.com
Nowadays Teclast is dealing with a better management of ID3 tag which has always been a drawback of rockchip players.
The greatest Chinese distributor/manufacturer(?) of emulators or clones is here http://www.worldunify.com/
Almost every known player can be found here... "unbranded"