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You can try to copy the 1.6 ctb from the internal flash to your SD card and compare it (binary). If you look at the install files for the modified ctb you should get some clues on how to do this.
If you already installed the modified ctb on R1.5 then the original 1.5 ctb should already be on your SD card at: Programs/_updatectb/_bin/ctb_original.
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