I was able to get several clean dumps and finally figured out how to patch a downgrade.bin... I think.
I was able to get the chip to erase, but now my problem is writing. Using any of the three write commands always results in a failure at 8192 KB with the following errors. Any input would be greatly appreciated. Thank you.

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Originally Posted by nortnil
I was able to get several clean dumps and finally figured out how to patch a downgrade.bin... I think.
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So apparently I haven't figured out how to create a downgrade.bin. I was able to successfully flash back to my original dump and boot the ps3. Good to know those dumps are in fact 100%.
I did notice that using the command writeword to rewrite my original flash.bin the writing was sluggish right up to the 8192 KB point. After that it flew through the last half of the file. I am guessing this has something to do with the first flash chip being written to and the second flash still being clean from the erase?