Upgrading Brand New S5 to Marshmallow

[Tony Android]

I have a NOS (new old stock) S5 SM-G900P (Sprint / Ting) on the way to me from e-bay. I got it for $220, not bad for a former flagship phone.

I'm thinking that the best thing to do is to upgrade the OS from KitKat to Marshmallow as soon as I activate the phone, before installing any apps or migrating any user data like a contact list.

Buying from ebay, there is no warranty and if the OS upgrade goes bad, I could be left holding a brick. The other upgrade issue that I dread would be the common complaint of greatly reduced battery life.

My two questions are:

First, can I upgrade (OTA preferred) from KitKat straight to Marshmallow (skipping Lollipop)?

Second, considering the upgrade would be from dead stock KitKat (no apps installed, no user data) to Marshmallow, are the odds of the upgrade having serious bugs close to zero?

 

[Tony Android]

Never mind. Phone arrived today and is already running the July 2016 version of Marshmallow.

 

[ironass]

Never mind. Phone arrived today and is already running the July 2016 version of Marshmallow.

Latest release for the G900P is PL2, 13th DEC: 2016...

Model SM-G900P
Model name GALAXY S5
Country Spint (cdma)
Version Android 6.0.1
Changelist 10090296
Build date Tue, 13 Dec 2016 04:31:08 +0000
Security Patch Level 2016-12-01
Product code SPR
PDA G900PVPU3CPL2
CSC G900PSPT3CPL2

 

[Tony Android]

Latest release for the G900P is PL2, 13th DEC: 2016...

Model SM-G900P
Model name GALAXY S5
Country Spint (cdma)
Version Android 6.0.1
Changelist 10090296
Build date Tue, 13 Dec 2016 04:31:08 +0000
Security Patch Level 2016-12-01
Product code SPR
PDA G900PVPU3CPL2
CSC G900PSPT3CPL2

A newer version is out. I got it OTA minutes after I installed PL2.
27th January 2017
G900PVPS3CQA2

 

[ironass]

A newer version is out. I got it OTA minutes after I installed PL2.
27th January 2017
G900PVPS3CQA2

QA2 is the second build of January 2017 and only just released. So new, it has not even been updated on my screens.