Make a full backup of your working image!
Try to install the openPLI 7 image as is, via your browser!
!!! DO NOT restart your stb !!!
Install now the estar secondary boot loader you need for your clone stb (google is your friend)
Restart your stb only after a successfully installation of your SBL
If the SBL installation was not successfully, then install back the working backed up image before you start your stb, otherways you will brick your stb!!!
This procedure let you find out, without to brick your stb, if the original image can be used on your clone stb...