Boot Camp not recognizing Windows 10 iso in Big Sir

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Level 1

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Boot Camp not recognizing Windows 10 iso in Big Sir

I've been struggling with getting Windows 10 installed on a new to me 2017 Macbook pro 15 running latest version Big Sir. (from DEC. 8, 2020) After launching Boot Camp and choosing the partition size, Boot Camp gives me an error saying it does not recognize the Windows 10 ISO file. This is a freshly downloaded file from Microsoft website and placed on my desktop after D/L. It is the 64-bit version and appears to be the only file available from MS on their website. I've tried numerous times. Considering looking for an older ISO but worried about security from alternate source. Does anyone have any ideas or have seen this issue? After searching for hours, it seems like Big Sir is a disaster for Windows Users in one way or another.... Any help would be greatly appreciated.

MacBook Pro 15″, macOS 10.15

Posted on Dec 9, 2020 6:19 AM

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Answer 1

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Vin_C_88 Author

Level 1

16 points

Dec 9, 2020 12:06 PM in response to Loner T

Doing this or 2 other things may have solved my problem! 1. Instead of keeping the ISO file on my desktop I moved the file to a new folder and pointed to the new folder - in addition.... I didn't realize my power cord was not plugged in fully and I was running on battery ... why these items would cause Boot camp to not recognize the ISO remains a mystery- but I am currently in the windows setup and it appears to be working correctly now,,, THANK YOU LONER T - I appreciate your time and help!!

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Answer 2

Loner T

Level 9

59,526 points

Dec 9, 2020 11:05 AM in response to Vin_C_88

In macOS Terminal, enter openssl md5 and drag the ISO filename from macOS Finder into the Terminal window and press Enter/Return.

You should see something similar to...

openssl md5 Win10_20H2_v2_English_x64.iso 

MD5(Win10_20H2_v2_English_x64.iso)= 10d50d88fac6306a00ddb41e983a046b

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Answer 3

Loner T

Level 9

59,526 points

Dec 9, 2020 8:20 AM in response to Vin_C_88

Can you post name and MD5sum of the W10 ISO file?

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Answer 4

Vin_C_88 Author

Level 1

16 points

Dec 9, 2020 10:44 AM in response to Loner T

Hello - Not sure how to obtain the MD5sum but the file downloaded from Microsoft today 12/8/20 is Win10_20H2_v2_english_x64.iso

thanks again!

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Answer 5

Loner T

Level 9

59,526 points

Dec 9, 2020 2:25 PM in response to Vin_C_88

Excellent!

For laptops, APFS operations and BC installation should be done when connected to power. One factor is the 'black screen' issue, when Windows GPU drivers are installed with default screen brightness. This setting differs for power and battery modes.

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