DO NOT UPDATE TO LATEST EFI - READ THIS!!!

Hello,
Do NOT attempt to insstall latests EFI update. It breaks Macbook Air stability. I just run tests and are 100% sure. My macbook after update is getting this messages in kernel:
WaitForStamp: Overflowed waiting for stamp 0x6 on Media ring: called from
timestamp = 0x0005
****  Debug info for apparent hang in Media graphics engine  ****
ring head    = 0x00000010, wrap count = 0x 0
ring tail    = 0x00000080 ring control = 0x00003001   enabled, auto report disabled, not waiting, semaphore not waiting, length = 0x004 4KB pages
timestamps = 0x0005
Semaphore register values:
    VRSYNC: (0x12044) = 0x5487a3
    BRSYNC: (0x22040) = 0x0
    RVSYNC: (0x 2040) = 0x0
    BVSYNC: (0x22044) = 0x0
    RBSYNC: (0x 2044) = 0x0
    VBSYNC: (0x12040) = 0x0
kIPEHR: 0x1000000
kINSTDONE: 0xfffffffe
kINSTDONE_1: 0xffffffff
after analyzing logs, this started to happen AFTER EFI update on 13 of September. This resulting in total hung of macbook. Now i want to roll back that update.
This is confirmed for Macbook 13" (Mid 2011)

kolargol22 wrote:
Can you please write this info about AHT:
- You press "d" when you turn on power or after that?
- Do you use filevault?
- Do you use TimeCapsule to connect or something different?
- Do you use firmware password?
Any idea why i cannot runt AHT ?
Thank you.
I press the power button and then press and hold the D key.
I do not, wouldn't be caught dead using it.
I connect numerous ways, I'll ocasionally use the USB-to-Ethernet adapter, I've connected to a Time Capsule as well as an AirPort Extreme Base Station. I'm currently connected to a corporate 802.1x wireless network behind an Aruba M3 Wireless Access Point.
I do not (nor have in the past on this particular machine)
Earlier in your post you indicated that that there's been an issue with the EFI firmware update on your machine. It's very possibly and likely that other services which are negotiated on the EFI level are not working properly as a result of the problem you're having.

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