I know there is an App for smartphones Drive Droid to let us do this, but it requires rooting the phone.
There is an old thread here on the forum about this App: http://reboot.pro/to... sd on phone
My cellphone is not a new device, in fact ts is old but it has been with me for a long time and as it is still working very fine I don't see a reazon to replace it yet and I have readen same models of this brand (Lanix) has some problems when rooted.
Then the only option was try to do it myself:
The cellphone when connected by USB cable to the PC has several options, one of them is Connect as Mass Storage Device, first idea was to install grub4dos on the MBR of the Micro-SD could work.
Then installed grub4dos MBR on the (FAT-32) Micro-SD and grld and menu.lst on the root of the SD + several .iso files into Iso folder, just as always do on my USB devices. But to my surprise when booted from it I got a message from grub4dos saying it can't find menu.lst, I tried to check if something was wrong but all was just as my USBs with grub4dos, so for an unknown reason this did not work.
Next I deleted the Iso folder, grld and menu.lst and installed AIO Boot but without formating the Micro-SD to don't losse my info, and installed the preselected option grub2 on MBR and with AIO Boot installed several WimPE .wim an Linux Lite x64 (Live), this time the PC booted fine from the Micro-SD on the cellphone and all runs fine.
EDIT: It seems there was a problem with C/H/S geometry of the Micro-SD card. Thanks to steve6375 the issue on grub4dos to find the menu.lst is solved now, once booting from grub4dos just by typing on command line the following:
Quote from Post No. 17
geometry --sync (hd0) >>> A message appeared saying:
Writing MBR for drive 0X80 ...sucess.
Partition num: 0, active, file system Fat 32, partition type 0X0C ...
Then I pressed ESC key and the menu.lst was visible finally.
Rebooted the PC twice and menu.lst appeared inmediatly as it usually does.
Now booting from grub4dos is possible too.
Edited by alacran, 16 October 2019 - 09:00 AM.