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Yes, I tested with 74.00.311 (not .324 yet), from which I was able to downgrade to FW 70 and FW 59 via the here mentioned method.

Info:
From versions below (not included) 74.00.310 you can downgrade as low as 59.00.502 via the usual update/downgrade process. But from 74.00.310 and higher, you only can downgrade as low as 74.00.310 via the usual update/downgrade process. That`s the reason why it is asked here if a downgrade fom 74 to 70 is possible via the method mentioned here in the thread.
 

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Hi everyone.
I just got a Mazda3 2015 and I want to upgrade its firmware to install CarPlay and AndroidAuto on it. the current CMU version is 56.00.513 4A N and as I understood I need to upgrade it to 70.00.100 first. I have downloaded the reinstall and failsafe files for Australia and dropped them into a thumb drive. However, I need to check the hash values or checksum before installing that on my car. I searched a lot for the hash values of ADR 70.00.100 but I couldn't find them. Can anyone help me with that, please?
 

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cmu150_ADR_70.00.100A_failsafe:
md5: 46D7A81AF84845EEA30557146221F303
sha-1: 0FD9A6F9708264AAC5AB734E5BA01F7245C01B08

cmu150_ADR_70.00.100A_reinstall
md5:
AFB5CF9AC044459C2A494C6B1EB46DD9
sha-1:
3AE99E08B99101F4090214541AEF366CED5FCB1A
 
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