2531760037 is Firmware version ( Target OTA version ) of 5.6.1 Firmware for PW2 (update_kindle_paperwhite_v2_5.6.1.bin) you can see it with KindleTool
>kindletool convert -i update_kindle_paperwhite_v2_5.6.1.bin
Checking update package 'E:\Downloads\update_kindle_paperwhite_v2_5.6.1.bi n'.
Bundle SP01 (Signing Envelope)
Cert number 2
Cert file pubprodkey02.pem (Official 2K)
Bundle FB03 (Fullbin [OTA?, fwo?])
Bundle Type Recovery V2
Target OTA 2531760037
MD5 Hash f801662729497bc85cdce1081872cb20
Magic 1 2048630901
Magic 2 1897089723
Minor 1
Platform Wario
Header Rev 0
Board Unspecified
Devices 14
Device Kindle PaperWhite 2 (2013) (Unknown Variant 0xF4)
Device Kindle PaperWhite 2 (2013) (Unknown Variant 0xF9)
Device Kindle PaperWhite 2 (2013) Wifi+3G Japan
Device Kindle PaperWhite 2 (2013) Wifi+3G Russia
Device Kindle PaperWhite 2 (2013) Wifi+3G Europe
Device Kindle PaperWhite 2 (2013) Wifi+3G Canada
Device Kindle PaperWhite 2 (2013) Wifi+3G
Device Kindle PaperWhite 2 (2013) Wifi
Device Kindle PaperWhite 2 (2013) Wifi+3G (4GB)
Device Kindle PaperWhite 2 (2013) (Unknown Variant 0x61)
Device Kindle PaperWhite 2 (2013) Wifi+3G (4GB) Europe
Device Kindle PaperWhite 2 (2013) (Unknown Variant 0x5F)
Device Kindle PaperWhite 2 (2013) Wifi Japan
Device Kindle PaperWhite 2 (2013) Wifi (4GB) International
P.S. Also I'm not sure what "-fwo" part means.
P.P.S. For the same example 5.4.5.1 has "Target OTA 2440520001"
Last edited by Dexmaster; 12-06-2014 at 09:31 PM.
Reason: P.S.
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