Unable to update A74 to version 4

[BrianEB]

My A74 is on version 2.0 firmware.  I have tried to update to V4.0 but when I try the following message comes up

'There is no media inserted in Slot 1 (there is), there is no update file in the media (there is), or the file is damaged' I have downloaded the firmware twice and same problem. 

To confirm:

SD Card has been formatted in camera.

File is exactly the same file name

File is in the root directory of the card 

I have had no problems previously as I updated up to version 2.

Think I must be doing something obviously wrong but just cannot figure out what.

For info, file downloaded on a MacBook

[danardeng]

THose are the file hash calculated with the file I've successful used to upgrade from 3.02 to 4.00:

BODYDATA.DAT - 872044952 bytes
MD5: 540d677f9d278d7f11cf7106032fc803
SHA1: 1913f11eae8e2df3fcc3a47107d6f5b2f46cdeee
SHA256: c9f2706805fccb4afac7e98f1cb120dd6e6703f8d6b07ed2a18c8151918fa28c
SHA512: 94ee8e844592ae52b95c25051dacdf8c64e4ee4752144c635b956561c5374f905e248c1feaec9258e763489ee95cd180401f9be9c38f83257aef2e3e1cfc6b81 

Check with your copy on https://md5file.com/calculator

If it's the same, try another (quality) SD card.

Otherwise I don't know.. with sony, sometime a factory reset work without any reason, but first save all your settings.