A small trick to program SPI flash on board.

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usbbdm
Posts: 8550
Joined: Mon Jul 18, 2005 9:33 pm

A small trick to program SPI flash on board.

Post by usbbdm » Sat Feb 29, 2020 10:27 pm


I remember older days people trying to raise the voltage to get flash detected. What I found during programming HT802 is the other way around. I need to lower the voltage to give SPI enough power but not enough for the CPU to be operational.
I explained why in latter video.
I will create a separate video unlocking Vonage HT802 voip box.

Boxnut
Posts: 20
Joined: Wed Feb 12, 2020 2:46 am
Location: Northwest US
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Re: A small trick to program SPI flash on board.

Post by Boxnut » Sun Mar 01, 2020 11:23 pm

There are a few old tricks that work, my choice is if JTAG, the 0rocessor is already initialized with very efficient SPI reading and writing to EPROM or e2prom.
Someone posted a means of bypassing the CPU and tapping the 4 wire directly, that can be made to work.
Some of my information may be incorrect, incomplete,or just plain wrong. Seems I am human. :D

usbbdm
Posts: 8550
Joined: Mon Jul 18, 2005 9:33 pm

Step by step to unlock Vonage HT802.

Post by usbbdm » Thu Mar 05, 2020 9:37 pm


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