I know this post is a million years old, but just for anyone else that stumbles across it, we now have an upgrade file for the Emerson ECC1450 in the JP1 group.
[Link: hifi-remote.com]The codeset uses the NEC1 protocol with a device code of 0, which is extremely common. Therefore, any "One For All" remote, that accepts keymoves (aka, "advanced codes") can be programmed to work this box.
You would first need to find an existing setup code that uses NEC1 dev 0, such as CBL/0040, then you would re-program the buttons using the following advanced codes:
182 - num 0
117 - num 1
121 - num 2
119 - num 3
052 - num 4
056 - num 5
054 - num 6
053 - num 7
057 - num 8
055 - num 9
184 - 100
123 - vol up
058 - vol down
122 - mute
059 - channel up
186 - channel down
250 - power
183 - tv/catv
180 - rcl (previous channel)
245 - sleep
249 - mts
181 - fc scan
185 - fc memo
116 - pc
120 - pc memo
118 - pc scan