Dell xpsl702x bios and driver's order

..Hello friends again..
Please heeeeelp!!!...before they ...drive me to psychiatric asylum!...to bedlam!..to..
Is now, 10 days maybe, I'm planning to clean install W7...and every day ..new questions in points arising....
So please if you know, answer me to the below.... ( We speak for Dell xpsl702x 17')
a)Someone advice me, in the subject of updating bios from A13 to A19, to pass from all the "between" versions..
A13 to A16, A16 to A17. A17 to A18, A18 to A19.... Why this? Is there an explanation?
I thought if you flash bios is like deleting the old one and installing the new...What I'm missing?..
b) Flashing bios..what about languages? must be the same like Os? could be different? Is a matter what language was the older version?

and last (for now)....Someone maybe know the correct order of installing the below :
a) HuronRiverHM67ChipserDrR289307.exe
b) IntelRapidStorR301364.exe
c) Intel ManagEnginInterfacR292317.exe
d) USB3_Renesas_W7_A03_Setup-61X2W_ZPE.exe
e) CardReader_JMicron_W7_A01_TKH3F_ZPE.exe
f) TurbobustR292797.exe
They are all about chipset - motherboard, all from Intel out d) and e)
...so according to the "rule"...must be the first drivers after Os.....but which order?..
When I read the "read me" file from b), if I understood well, was written that the Intel software utility..(I suppose chipset?)
must be installed first prior Os?...that means from com. prompt?.....to much confuson for my small mind.....
.........Maybe someone knows how "things"....must be?.....
Thank you...really ....very much....

Someone else will have to advise you on the BIOS. Most of them only require flashing the latest, but we have Dell experts here who will know for sure.

I can advise you on getting a perfect Dell Clean Reinstall - Factory OEM Windows 7. Just read and follow closely the steps in the tutorial, especially about how drivers are handled in Win7 which is different than previously. Wait to see which drivers are missing after all rounds of Important and Optional Windows Updates are completed.

There are also Special Notes for Dell Owners at the end of tutorial to help you decide whether to keep the OEM Tools partition if it will indeed boot to run Dell Diagnostics Utility - How to Run the

Then go ahead with the Clean Reinstall after reading to understand the steps in the tutorial. Let's focus on the steps now instead of chit-chat that wastes time.

You can judge afterwards if you want to update the BIOS based on performance.

Since you didn't seem to absorb specific information I gave you before, take note that you should delete all partitions during install, unless Dell Diagnostics will still run as shown in the tutorial I posted for you to run it. Then you can save the OEM tools partition only.