5508 IOS downgrade problem

Hello,
I have an existing 4404 setup that I need to migrate all the AP’s over to a new 5508 setup. I also need zero downtime in my setup. I purchased two new 5508 controllers that I will join to the mobility group, move the ap’s, and then setup in a master/slave setup.
The Problem:
The two 5508 came with IOS 7.2.103 while the 4404 is on 7.0.116. I have downloaded, multiple times the 7.0.116 code and tried to apply on the 5508 without success. I keep getting a signature failure followed by the “TFTP Failure while storing in Flash!” message.
Troubleshooting so far:
Tried both controllers
Tried downloading the IOS again, on different computers.
Used TFTP program from SolarWinds and tftpd32
Tried different cables, different ports. Tried from GUI and CLI both.
Tried to downgrade to 7.0.235 instead.
Always the same message. What am I missing?
Thanks,
Todd

did you use 7.0.116.0 code for 5508 or trying with 4400 code - This may give signature failure.
is there a specific reason to use 7.0.116.0 code on 5500.
WLC-5500>show boot - Do you see software code other than 7.2.103.0
To eliminate signature and flash errors try superimposing 7.2.103.0 code on 5500 WLC.
Also, try upgrading the FUS image if not already to be sure that flash is not corrupted.
i'd RMA if none works.

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1)
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