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need formware file upgrade panasonic NS500BX and ns520

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rafik23

rafik23

IS-IT--Management
Nov 23, 2018
5
DZ
hi people
had anyone firmware for kx-ns500 and kx-ns520
i have on my pbx ver 4 and i want to upgrade to 6

thanx in advance
 
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my suffix is BX and i fount it on internet the NS300 an 500 and 700 are working with the same firmware

thank you for your answer
 
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