@robinang
You must take boot.bin from US firmware 5.10 and fw_resource.bin and fw_all.bin from SG 2.80.
Then you must change with rgn tool number of HWID and SWID to number of us boot.bin.
If you have boot.blk number 972 here is flash for you to convert US to SG.
Dont forget to change your folder VOICE and TEXT to voice1 and text1 and then copy to your unit SG folder voice and text.
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