unable To write EFI files

#1

Hi :slight_smile:

I own a MacBook Pro , OS 10.14.5 and I did a clone of my bootcamp partition with Winclone 7.3.4 because I wanted to erase my computer .
All worked fine .
I put a new OS 10.14.5 on my computer , did a new bootcamp partition , with « bootcamp assistant « and a windows 10 image . All worked fine .

Then I wanted to use Winclone to restore my old bootcamp to the new one 
But at the end I had the error message « winclone is unable to write the EFI files « . I tried another time , but always the same message 

Can someone tell me what’s wrong and how to fix it ?

Thank really

Marc

#2

Sure. This article addresses the issue:

tim

#3

Thanks really Tim !
My bootcamp disk location is disk0s3
So I Wrote diskutil mount disk0s3 in my terminal 

This is the answer :
Last login: Mon May 20 11:57:00 on ttys000

MBP-de-marc:~ mducasse$ diskutil mount disk0s3

Volume BOOTCAMP on disk0s3 mounted

MBP-de-marc:~ mducasse$

But no EFI disk appears on my macBook 's desktop after doing that 

Can you tell me where is my mistake ?

Thanks really

#4

I desintalled my anti virus software and once again restored my Winclone partition to my Bootcamp Disk 
 Same thing " Unable to write EFI files " .
But I Don’y understand the lit you gave me above tells:
The EFI partition is MS-DOS (FAT) formatted, and should be mountable and writeable in macOS.

however, the first thing winclone does during the restore is to format my bootcamp partition in NTFS ; so it’s normal that the EFI files can not be written if they are MS-DOS (FAT) formatted ?

What can I do ?..

Thank you !

#5

Hello :slight_smile:

My problem is always the same 
 I did what you told me with the terminal , but nothing happens and no EFI disk appears on my macBook 's desktop after doing that 

I desintalled my anti virus software and once again restored my Winclone partition to my
Bootcamp Disk 
 Same thing " Unable to write EFI files " .
and so when I try to boot on my Bootcamp partition , windows start but always launch the repair process, which never ends and asks to restart. If I start again, the repair process starts again and so on 


What can I do ?

Thanks really for your help

#6

Is disk0s3 the EFI partition? It is usually the first slice, or disk0s1.

tim

#7

disk0s3 is my Bootcamp partition . That s why I used it to follow your instructions . I send you a copy of my tests in the terminal’s windows 
 But never an EFI disk appeared on my desktop 

What can I do ?
Thank you very much

19
Capture d’écran 2019-05-24 Ă  13.22.19.png1150×740 157 KB

37
Capture d’écran 2019-05-24 Ă  13.15.37.jpg1682×1048 166 KB
51
Capture d’écran 2019-05-24 Ă  13.15.51.jpg1682×1048 165 KB

#8

53
Capture d’écran 2019-05-24 Ă  13.31.53.jpg1176×858 220 KB

#9

Please tell me what to do , I’ m lost :frowning:

#10

You need to put ‘sudo’ in front of the mount:

sudo diskutil mount disk0s1

tim

#11

Hi Tim

Thanks really ! this time all worked 
 Image successfully restored !
But when I tried to boot on my bootcamp partition I had this new error 

What can I do ?

Thank you !

MarcIMG_3931

#12

no one can help me ? :frowning:

#13

You are close. What year of MacBook Pro is it? Try changing between EFI and legacy booting modes:

tim

#14

Hi Tim

I do not understand the procedure explained in the article:(
“select your Windows volume under sources. "
What is “sources " ? where or how can I find it ?
I can not find the button” make EFI Bootable 
”

Tha,ks a lot for your help !!:slight_smile:
Marc

52
Capture d’écran 2019-06-04 Ă  17.24.52.jpg1166×706 119 KB

#15

This is probably because the new drive was formatted as MBR rather than GPT:

tim

#16

Thanks Tim .
But I don’t think so 
 I made the bootcamp partition with bootcamp assistant ; not with disk utility . So I think that bootcamp assistant formatted well the disk 

What’s your advice ? 


45
Capture d’écran 2019-06-05 Ă  23.35.45.jpg1564×984 105 KB
17
Capture d’écran 2019-06-05 Ă  23.35.17.jpg1512×960 236 KB

#17

Hi Tim

Maybe I ve to make it refi bootable , but I told you “select your Windows volume under sources. "
What is “sources " ? where or how can I find it ?
I can not find the button” make EFI Bootable 
”

Thanks for your help

#18

Hi Tim
ok , after long research I found the settings to switch between EFI & Legacy 
 your article could have stipulated that IUploading: IMG_4138 - copie.jpg
 should use winclone 

If I make bootcamps legacy bootable , my computer don’t find the bootcamp disk when I restart 

If I make bootcamp EFI Bootable I always get this screen when I boot on bootcamp 

Thanks to help me to find a solution 
 it’s been 3 weeks that I try to use Bootcamp 


Thanks
Marc

IMG_4138%20-%20copie
IMG_4138 - copie.jpg906×680 400 KB

#19

Hi Tim

can you help me please :slight_smile: what can I do 
 We can see on the picture I sent to you that my disk is GUID Partition 
 and there’s always the blue screen I sent you above 

Thanks really for your help
Marc

#20

Ok , so no reply 

I can erase my backup winclone, I guess there is no solution to my problem?