Ohh, sorry, I thought you were replying now from your desktop or something.

OS does not matter to being able to boot to BIOS, if you messed up the OS, either, or the HDD/SSD etc, it would have still booted to BIOS.
You should have removed the HDD/SSD and then got into BIOS, instead of erasing and trying to write the BIOS without even confirming you can't enter it I know, too late now

BIOS chip is fine, no need to replace

Im using my phone to reply now.

This problem started stuck in Acer logo screen and loading bar stuck about 70 percent. I can no longer boot.
I can not also enter bios.

I tried to troubleshoot by removing parts such as hdd, ram, cmos battery. But still persists on stuck on acer logo.

Then when i tried to flash the bios to a new bios rom, my computer no longer turns on.
No output on screen, no acer stuck logo. Totally dead, it has also no status light.

I checked my charger and it gives the right voltage so i ruled out the possibility of broken charger

Edit:

Here are the result of experimenting from different versions:

Version 1.29
- when I press detect it does not detect the chip. I manually input my chip number
- was able to read and verify successfully after erasing contents of chip
- was able to write successfully on chip but when verified it shows error " Verify failed chip main memory with contents in disagreement". Tried reclipping several times but still persists
- here is a link to the files http://www.mediafire.com/file/p8b2k6pa7s...er1.29.zip/file. The link contains the JE40213.ROM the bios that I program on the chip and the other 3 files are the ones I read from the chip. After every reading I removed the programmer and reclip.

Version 1.30
- cannot also detect my chip. I manually chose my chip number
- It gives error "Access violation 0097EA42. Read of address 0097EA42" when i press detect.
- when i try to read is says could not find chip

Version 1.34
- same sa 1.30

AsProgrammer 1.4.1
- it can read the chip
- when i try to program. It hangs on "Possible protection is enabled. Programming memory (verfying)"
- when i try to unprotect before writing, it hangs with a message SREG (0xFF,0xFF)

@diode121 - So, before you did anything to the BIOS chip, you removed hard drive and tried to boot to BIOS? If yes, then BIOS was probably currupted at that point,but shouldn't have been caused by a windows OS version roll back.
I guess anything is possible now with Win10 these days, since they are pushing out BIOS updates to users now without notification and then on reboot they are bricking left and right.
I've had to help about 10+ Asus users with various models recover BIOS from this in the past year, some other brands too, but Asus one sticks out because of how many users found us all fixing and complaining in this one big thread here a while back.

In your very first post, you said "I think I may have flashed the incorrect bios" And I asked you to confirm the proper model, and link me to the page, and you linked same page/model that you said was incorrect
Are you 100% sure now, your model is 4755G and this is your BIOS download page https://www.acer.com/ac/en/US/content/su...roduct/3803?b=1
Just to confirm again before we move forward

When no chip is detected, do not enter anything, reclip, it's not detected because it's not connected, detection has nothing to do with software version or ID etc.
Anything you do after non-detection, without re-clipping the chip, is not valid (nothing is read or written, other than possibly invalid data either way)
Once chip is detected, and you have not moved the cable or the clip even the tiniest bit, then you never need to re-clip it again unless it accidentally moves.

DO NOT remove and reclip for no reason, ie "After every reading", the clip will wear out very quickly and it then wont be able to grab onto the BIOS legs anymore.

1.29, 1.30, and 1.34 can all detect your chip no problem, chip detection is not about software version, it's about physical connection is proper or not

For ASProgrammer, use this method to write >> Open program, select IC, hit "unprotect" Icon (not the drop out menu, just the icon), then erase, then blank check, then open BIOS file and write then verify.
At least you hit unprotect, that is good What do you mean "Hangs" is program frozen then, and you have to force it close?

Please connect this way again, the click unlock dropout menu, click edit sREG and then read, and show me image of what you see.

Do you have main battery installed? Do you have main PSU cable installed? Sometimes this matters, some systems need them removed, some need them connected.
Try again with both one at a time, then both together, and see if it all looks same with ASProgrammer when you hit unprotect (not the stuff I told you above, just normal hit unprotect icon, does it still then give you same SREG (0xFF,0xFF))

For all CH341A softwares when you try those again, go into the "Operate" menu at top, and make sure only "Main Memory" is selected

@Lost_N_BIOS - Yes, before I messed with BIOS, I troubleshooted it first by removing components like hdd and ram but it still stuck with Acer logo. I can't even enter bios menu.

Yes I'm sure that this will be the link for my BIOS, because it is the only link for 4755g model. https://www.acer.com/ac/en/US/content/su...roduct/3803?b=1. I think the latest model for the BIOS in that link is the 2.13 bios version since it supports graphics card.

While experimenting with all the versions and studying the guide thread that you made. I thing version 1.29 is the version suited for my chip. This version detects my chip correctly (it shows the name, manufacturer,id). I was also able to erase and check blank with no error. I can also write on the chip but it fails during verification with error saying "Chip main memory with contents in disagreement".

I am also having success on the AsProgrammer. I can write on the chip without error. However when I compare the ROM that I used for programming and the contents of the chip, they are not the same. I think the rom is not being written properly on the BIOS chip

Edit:
On the operate menu, should I also unchecked "SST/ESMT chip uses AAI program mode" and "Use block/sector erase mode"?

And also I'm flashing the bios chip with CMOS battery, main battery and laptop charger removed

@diode121 - OK, thanks, I just wanted to confirm again about the BIOS, since you mentioned you flashed wrong one or programmed in wrong one etc.
The .ROM BIOS inside DOS folder should be bootable, once programmed in properly. Sorry, not sure what "Thread that you made" you're talking about? I never made any guide or threads about this.
As mentioned, chip detection does not have anything to do with software version, except in cases where your BIOS ID is not in the list that program has, but it would always "Detect Chip"
So, you confirm 1.29 can read (maybe properly, maybe not, you'd have to be able to write/dump/compare to confirm), and can erase OK (again, maybe, you can't confirm without being able to write first to know what is there, to then dump and check)

Being able to "Write and verify" without error, does not always mean there is not any errors, this is why I told you to manually close program, open again, then read, verify, save and then compare in hex.
So, as you mentioned, your then read/dump/compare later does not match, this means either bad read or write, still unsure which or both.

Yes, uncheck those and make sure "Main Memory" is the one selected.

As mentioned, test with main battery in and PSU cable connected as well, sometimes this is required. CMOS always leave in

It may be best for you to now try flashrom methods instead, since you're having so many hassles here! Here is GUI version you can try in windows first - [Guide] Using CH341A-based programmer to flash SPI EEPROM (34)
And here is normal flashrom method, you'll have to use Linux or Ubunutu live CD/USB - [GUIDE] The Beginners Guide to Using a CH341A SPI Programmer/Flasher (With Pictures!)

This guide [GUIDE] Flash BIOS with CH341A programmer . I'm sorry I just misread it it thought it was written by you instead you were just acknowledged by the author. Anyways this is a good tutorial.

By using ver 1.29, I am able to delete the contents of the chips and successful on blank veryfication. I only failed when I'm writing on it.

And there is a strange thing that is happening, I tried to program it using JE40213.ROM then I read the contents of the chip let call it Dump1.ROM. When i compare JE40213.ROM and Dump1.ROM they are not the same (totally expected this!). Now this is the strange part, when I read the contents of the chip again, let's name it Dump2.ROM.
Dump1.ROM and Dump2.ROM is not the same!!..I tried it several times, and not even once they are the same. It seems like everytime I read it it gives me different values..lol

I thought maybe my programmer or chip is faulty, so I tried to erase the contents of the chip. Then I read the it multiple times. But now all dumps are always the same!

Thank you for the link for the flash rom GUI, I'll try it later. :)

@diode121 - Try this ASprogrammer (2.0.0a14) attached at last post here - https://www.badcaps.net/forum/showthread.php?t=82992
Also, try 1.38 and ASProgrammer (2.1.0.13) from this download as well - https://www.mdclab.it/lab-usb-programmer-ch341a.html

You can't confirm it's blank without being able to dump it, you can only confirm that 1.29 thinks it's blank

That is normal/expected, this means it's not reading correctly (ie not compatible), and so you still cannot verify anything was written properly either.

@Lost_N_BIOS - Thank you very much for all your help and suggestion. I was able to repair my laptop.

The solution is on the first page of this thread.

@diode121 - You're welcome, great to hear you fixed the system! Yes, sometimes chip removal is the only way, but it's very rare.
Anyway, glad to hear your system is now back up and running, great work!

@Lost_N_BIOS hi i have the same laptop with him and with the same issue (stuck at acer logo). ihave already read the guides u made here and for some reason i clicked erase without dumping data files from the bios chip. how can i restore my macid, s/n, etc.,? thanks for the guides bro i also fixed mine but macid, etc is missing. i still have the stickers in my laptop soo i am hoping u could help me. thanks!

Hi @Lost_N_BIOS, can you help me with my problem in ME Region? May laptop Shutoff every 30 minutes and i knew that you is 1 of the heroes here :( please helpe :(

can you share the .bin/.rom file you successfully programmed on your BIOS CHIP. thank you!