[AT&T Samsung Galaxy Note I717] darkspr1te:
The Bootloaders for msm8xx0 devices are as follows

527K Jan 6 2012 aboot.mbn
115K Jan 6 2012 rpm.mbn
72K Jan 6 2012 sbl1.mbn
111K Jan 6 2012 sbl2.mbn
601K Jan 6 2012 sbl3.mbn
117K Jan 6 2012 tz.mbn

these are placed in the locations listed below

Device, Boot, Start , End , Blocks, Id , System,Partiton Name ,File to restore from backup,file to restore from firmware
/dev/sdc1,,1,204800,102400,c,W95 FAT32 (LBA),SMD_HDR,smd_header.mbn,
[B]/dev/sdc2 ,*,204801,205800,500, 4d , QNX4.x,SBL1,,sbl1.mbn
/dev/sdc3 ,,205801,208800,1500,51, OnTrack DM6 Aux1,SBL2,,sbl2.mbn[/B]
/dev/sdc4 ,,208801,208801,0,5, Extended,EXT,ebr.mbn,
[B]/dev/sdc5 , ,212992,213991,500,47, Unknown,RPM,,rpm.mbn[/B]
[B]/dev/sdc6 , ,221184,225279,2048,45, Unknown,SBL3,,sbl3.mbn[/B]
[B]/dev/sdc7 , ,229376,234375,2500, 4c, Unknown,ABOOT,,aboot.mbn[/B]
/dev/sdc8 , ,237568,258047,10240,48, Unknown,BOOT,,boot.img
[B]/dev/sdc9 , ,262144,263143,500,46, Unknown,TZ,,tz.mbn[/B]
/dev/sdc10 , ,270336,271335,500, 5d, Unknown,SSD,,
/dev/sdc11 , ,278528,279527,500,91, Unknown,PIT,,Shv-e160l.pit
/dev/sdc12 , ,286720,307199,10240,93, Amoeba,PARAM,param.lfs,
[B]/dev/sdc13 , ,311296,511999,100352, c, W95 FAT32 (LBA),MODEM,,amms.bin[/B]
/dev/sdc14 , ,516096,522239,3072, 4a, Unknown,MSM_ST1,efs.img,
/dev/sdc15 , ,524288,530431,3072, 4b, Unknown,MSM_ST2,,
/dev/sdc16 , ,532480,538623,3072,58, Unknown,MSM_FSG,,
[B]/dev/sdc17 , ,540672,741375,100352, 8f, Unknown,MDM,,mdm.bin[/B]
/dev/sdc18 , ,745472,751615,3072,59, Unknown,M9K_EFS1,efsclear1.bin,
/dev/sdc19 , ,753664,759807,3072, 5a, Unknown,M9K_EFS2,efsclear2.bin,
/dev/sdc20 , ,761856,767999,3072, 5b, Unknown,M9K_FSG,,
/dev/sdc21 , ,770048,790527,10240, ab, Darwin boot,DEVENC,enc.img.ext4,
/dev/sdc22 , ,794624,815103,10240,60, Unknown,RECOVERY,,recovery.img
/dev/sdc23 , ,819200,839679,10240,94, Amoeba BBT,FOTA,,
/dev/sdc24 , ,843776,3911679,1533952, a5, FreeBSD,SYSTEM,,system.img.ext4
/dev/sdc25 , ,3915776,8114175,2099200, a6, OpenBSD,USERDATA,userdata.img.ext4,
/dev/sdc26 , ,8118272,8736767,309248, a8, Darwin UFS,CACHE,cache.img.ext4,
/dev/sdc27 , ,8740864,9005055,132096, a9, NetBSD,TOMBSTONES,tomb.img.ext4,
/dev/sdc28 , ,9011200,10035199,512000,95, Unknown,HIDDEN,hidden.img.ext4,
/dev/sdc29 , ,10035200,30777343,10371072,90, Unknown,UMS,ums.rfs,

The highlighted paritions are the ones that contain the bootloaders for MAIN CPU (Application CPU/APP CPU) and the modem (MSM9600) mdm.bin

to copy/backup a boot loader do the following

dd if=/dev/block/mmcblk0p2 of=/sdcard/sbl1.mbn bs=512

and to replace the boot loader

dd if=/sdcard/bootloaderfilename of=/dev/block/mmcblk0p?

replace bootloaderfilename with the file of your choice and the ? with partition it goes too.

**PLEASE NOTE**

MY device was altered to be unbrickable

copying the wrong bootloader or currupt bootloader to the device could BRICK the device and put you in QHSUSB mode, dont ask for support if this happens, please refer to my debrick thread, there is no point me repeating the details.

mdm.bin is the MSM9600 modem and AMMS.bin is the main CPU

the CPU boots first via the sbl1/2/3/aboot.mbn then loads the mdm.bin into the modem using Sahara protocol ( similar to QUSB/QHUSB protocol)

the application cpu handles main gsm comms and the MDM9600 handles LTE etc (see my debrick thread for E:V:A, he provides full details)

most of the problems i've seen with the data/wifi side of the device stem from a damaged TZ.mbn , in fact tyler had same issue in my debrick thread which i created a specific repair for,

actual settings for the Qualcomm modems/wifi are not contained on the devices EMMC or internal sdcard but in NVRAM in QCL files, these are altered using qpst and i do not recommend you change them without backups and research first what you are changing.

Also some codes that access service menus

http://xdaforums.com/showpost.php?p=33546151&postcount=91

darkspr1te