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How to update my CRS-1 8slot router from version 3.8.4 to 4.3.2 ???

Like the title said, how to update my CRS-1 8slot router from version 3.8.4 to 4.3.2 ??? I have got the software of 4.3.2 and rommon 2.9 . When I began my process , I found that it seems we need an extra file named hfr-upgrade-p.pie, but there is no such file in the software 4.3.2 . Please kindly help to tell that where should I find it and is there anything other to do when updating from version 3.8.4 to 4.3.2.Tks a lot

 

 

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