ttyACM0 unstable can't use flashtool - Redmi Note 9 Questions & Answers

Hello everybody!
Redmi note 9 (merlin) - MUI 12.0.5 - Fastboot unlocked
I follow a post to install TWRP, but it was probably a bad release for my phone.
I think I've completely brick my phone, no recovery, no fastboot.
The device reboot with logo Redmi and I can see the open padlock. When I try to boot on EDL mode the device is visible but really unstable
ttyACM0 is visible after volume down but disappear after 6 seconds . I don't have time to do anything.
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Commande line with flashtool :
./flash_tool -s ../V1104/merlin_global_images_V11.0.4.0.QJOMIXM_20200528.0000.00_10.0_global/images/MT6768_Android_scatter.txt -d MTK_AllInOne_DA.bin -c firmware-upgrade -a auth_sv5.auth
I don't know if it's a problem with M6768 or i forgot something ...Don't know what to do .... Please Help !!
- Same error with Windows.
- Test with battery charged, plugged and unplugged

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The script succeeded but when I tapped "reboot system" it suddenly showed a blank screen without any sign of life.
Any solutions to this? Am I wrong to directly flash global dev rom in TWRP?
Additional info:
I did the partition mod way back. So my system partition is only 1 instead of 2.
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I had same problem and I can resolved with this thread without hardware mod
http://en.miui.com/thread-73348-1-1.html
In Miflash have this device?
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Solved. Thanks!

I Bricked My Redmi K20 Pro Need Serious Help

Hello everyone. I was updating my phone with Mi Asistan from stock recovery. When updating my phone on %60, my pc gave me "dissconnected sound". When i look back the screen i saw "The system has been destroyed" I cant boot recovery mode. Only i get fastboot mode. I cant use miFlashtool for install rom or i cant flash twrp on fastboot because my bootloader is locked. I tried open bootloader but device does not have mi account.
For shortly i can use only fastboot mode but phone is locked. No recovery or anything.
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Stuck with upload Mode ( RAM Dump by hard Reset )

Dear All,
I have Samsung note 8 N950U with SPR CSC
I wanted to flash a combination file COMBINATION_FA71_N950U1SQU8ATF1_CL13942288_QB32228349_REV00_user_mid_noship_MULTI_CERT.tar.md5.zip
using patched Odin
after success flashing the phone wont power up just the screen booted into upload mode cannot boot into download mode either recovery or even OS
please anyone can help me with that ?
even power + valume down up to 7 mins doesn't work the device just blinking every one mins
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I have the same problem, Who have one solutions??

Question Redmi 9T dead hard bricked

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Dear Lovely peoples of xda, I've spent 2 weeks to figure out how to fix this problems.
Last ota update 12.0.11 reboot and bsod-blacnk screen of death
Pwr+vol up, Pwr+vol down doesnt work, no vibrate while press power button. cant adb,fastboot or recovery mode.
i been tried using various number of flasher, Qualcomm Qfil, Xioami Flash Tools.
anybody can help thru teamviewver or anydesk highly appreciated.
i will send 20 XRP as a appreciation token.
Try an older version of QFIL, more specifically 1.0.0.2 or 1.0.0.3, or you can use QFIL from within QPST instead.
@eddiekarpov any luck?
i have the same problem
same problem here, is it fine now?

REDMI 6A - UNBRCIK

BRICKED PHONE - FIX (NO FASTBOOT, NO RECOVERY, ETC.)​
DOWNLOAD: Mediafire
BYPASS​Open REV4 Bypass tool, off your phone. Click BYPASS Connect phone to PC and Turn ON your phone.
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FIRMWARE​Download FIRMWARE (Fastboot) - DIRECT - SITE
SPFLASHTOOL​Open SPFLASHTOOL choose in Download-Agent No_Auth.bin
Choose in Scatter-loading File (MIUI.XXX FOLDER - IMAGES - MTxxx_Android_Scatter
Choose in Autentichation File auth_sv5.auth FILE
FLASH​Click Download and FLASH (ON BLACKSCREEN)
Done if you want help comment.
Trickbot detected.
Edit: it won't even let me execute on a virtual machine. VERY shady.

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