you can not mod 9.0.48 firmware because nothing was yet created so that you can fully extract the firmware. the current s1fx tool dont work, new tools are being developed. you will have to wait untill a tool is created so that you can extract firmware 9.0.xx and above. just recently the guy that makes the tools, created one for 9.0.43. i would recomend that you do not flash your player with other firmware because the chances of the firmware not killing your player is slim.
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