tryit

Just wondering ,  why not utilize included Clover r 5141 driver option  VboxHFS  driver instead addition HFSplus driver ?

also after complete the installation ,   only  boot  from  "preboot " , does it normal ?

 @Hervé Thank you for comprehensive, detail  and great guide 

I just trying with OpenCore and UEFI wont detect neither , then removed the hard drive and detected by  EFI  as it should 

there was EFI windows boot manager  on EFi boot list cause this problem and all good now 

 

 

 

Thank you Jake, will try that 

Yes, I did  format the USB installer to  GPT (GUID )  / Journal Extended  with disk utility

Hello,

 

I am  following  guide below , to create USB installer for Big Sur for E7270 , but wont boot to Clover  R5133 and neither recognize on UEFI list , change to different USB port and thumb drive but still fail. As well as following suggestion for BIOS setup on that guide . And use the same BIOS 1.31.3. Do I miss something ? Please advise and Thank you

https://osxlatitude.com/forums/topic/15648-dell-latitude-e7270-with-i7-6600u-hd520-and-1920x1080-touchscreen-high-sierramojavecatalinabig-surmonterey/

 

 

 

 

The problem I had  with  Toshiba HDD MK2556GSY  , I change to WD  HDD  WB5000BPKT and booting no problem .

I still wondering why  use the same EFI boot, same SATA to USB adapter, same laptop ,  but  that Toshiba drive fail to boot it self after finish installation .

May be somebody can explain it . Thanks 

I move it as internal hd . it wont to boot either.

Not sure why The E5420 Bios just recognize EFI / boot if under MBR partition , but not GPT

 

disk 1 is my HDD

disk 2 is  my usb boot 

 

 

 

 

try to install clover and fail

 

added     EFI/Boot/bootx64.efi    BIOS UEFI  wont boot 

 

I  just tried that HDD as external USB to newer Latitude 5400 and being recognized as EFI partition and will go clover booting menu 

so no problem UEFI 5400 ,but problem E5420

 

btw attached my USB thumb boot  drive

 

This is my first build  OS X on Latitude E5420 so really newbie and nope about it, I am able to install Catalina on E5420 on external USB HDD drive, it looks all functioning well as it should ( Audio, keyboard and mouse pad , wifi, and ethernet ).

I use Boot Disk Utility on USB thumb drive and clover legacy boot. 

Now I am wondering how to boot up without  USB thumb drive ?

I mounted  EFI partition on HDD drive and copy USB thumb drive 's EFI folder + boot to EFI partition but has no luck and wont go to boot menu

 

 

 

Please advise  and  Thank you for all your help