HP8600 Plus won't send or receive fax after firmware upgrade

Hi All,
Suddenly my HP8600, refuses to send or receive fax. I get the message "Can'r send or receive fax" immediatley after power up. I have a strong feeling that the problem started after an automatic firmware upgrade to version OJP8600_N911a_R1435A . Unfortunately there does not seem to be a simple way to downgrade or is there? HP refuses to tell. I have checked the telphone line and the connection also tested with another fax machine. I tried resetting several times without any success. It is just out of warranty and works perfectly in all other respects.
Do someone have any ideas?
Thanks in advance.
Bondra12

Hello @Bondra12 , welcome to the forums
I understand you now cannot send or receive a fax, and I am here to share my suggestions with you.
No, you cannot reverse a firmware upgrade from my knowledge. I would suggest however, troubleshooting the fax problem by trying out the steps from this guide: Cannot Send or Receive Faxes
If the problem does happen to continue, and I wish that it doesn't, to give us a call to see if you have any out of warranty printer options.
Please call our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region. http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html
Best wishes,
R a i n b o w 7000I work on behalf of HP
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Click the “Kudos Thumbs Up" at the bottom of this post to say
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Click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution!

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