[General Questions and Answers] Vinayakrg:
preloader or "MediaTek DA USB VCOM" disconnecting

Name Vinayak Email : imvinayakg@gmail.com

Hi With Great interest i have read your solution to the connection disconnected in 2 seconds for pre loader.

more than 10 times

Ok I have used ur instructions one by one and executed it.

but still having problem of disconnection. i have did this in 4 different ways.

Drivers used: 1. Signed: MTK_USB_All_v1.0.8 (Seems Original, yes off course),

signed means the "DA USB VCOM"

2. Unsigned: drivers included in stock rom.

signed means the "MediaTek DA USB VCOM" (your told / said driver)

ok just have a look what i have did in 4 cases.

in every case pc win7 is booted in >>>> 'allow unsigned drivers'.

case 1. at first i have installed the signed drivers but it was assigned as preloader.

->>>> a) (without pressing + volume key )

here as u said i connect the phone Micromax a210 mtk6589 turned of with the battery.

The device manger is already opened, immediately gone for update driver. then selected signed "DA USB VCOM" Driver.

Which was installed earlier.

Method for update of hardware driver.

Update Method / Trick : Here at every time, whenever you go to update driver, after selecting the appropriate driver.

for example if i want to change "preloader" to "DA USB VCOM"

Click as :>>> Update driver(in less than 2 seconds : yes done) then click >>>> Let Me Pick the driver

then >>>> Ports (COM & LTP) then >>>> remove the tick from the box that means 'Show Compatible Hardware' and it will list all the all drivers (or both the drivers Signed and Unsigned) related to Port (Com & LTP)(Protocol)

Then select the needed driver for installation.

Here is the trick at every time you change the driver.

at this time connect the mobile and immediately when or at the connection sound beeps hit the next.

(in case of unsigned driver it will again ask, do you want to install the unsigned drivers immediately click yes)

after clicking next or yes at this time it will again accepts the hardware for change and change/updates its driver.

this is very fast just in 2 seconds and at the time of clicking the next or yes. 1 second is almost gone.

Result : Diver is updated successfully. (in all 4 cases)

ok case 1 continued : so i updated to Signed Driver "DA USB VCOM".

now at the time of sp flash tool. here i wanted to only flash i.e. to download only the original recovery /stock recovery.

into the mobile, removed rest all ticks and only selected recovery.img for flashing.

Then clicked >>>> Download button. Then >>>> the bricked Micromax Phone, battery inserted, and connected to the usb.

The result of case 1 : after connection it shows but in 2 seconds it disconnects it.

And in sp flash tool error : red bar appears then pmt changed for the rom

similarly Case 2 : (for Signed driver)

b) (pressing + volume key ) during the driver update connection of phone

with pressing and holding Volume + (Up) Button for while.

after rebooting and checking it again disconnects the phone.

again tried with sp flash tool clicked download and connected the phone holding the volume plus button.

again disconnected

Case 2 Result : connection terminated, and in sp flash tool red bar appears then pmt changed for the rom

similarly Case3 : (for unsigned driver)

a) (without pressing + volume key ) "MediaTek DA USB VCOM" driver updated successfully.

in simple USB connection the connection is terminated.

then tried with sp tool again same disconnected problem appeared.

Case 3 Result : connection terminated, and in sp flash tool red bar appears then pmt changed for the rom

Case 4 : for unsigned driver

b) (now pressing + volume key )

"MediaTek DA USB VCOM"

1.	holding volume Plus Button continuously until the driver gets updated successfully.

2.	Then as you said the rebooted and re checked with holding the Volume Up (Vol +) Button. still failed.

the "MediaTek DA USB VCOM" from device manager again disconnected.

3.	now with sp flash tool clicked download, holding vol + again after 2 seconds disconnected.

case 4 result : same : connection terminated, and in sp flash tool red bar appears then pmt changed for the rom

please help contact me at imvinayakg@gmail.com