[US GENERIC E5506] Problem finding 5.1.1 FW update after flashing back to 5.0 - Sony Xperia C5 Ultra

Hello and thank you greatly for taking the time to read my thread, your help and wisdom is greatly appreciated.
I will provide a short and long summary of the events that unfolded with my US GENERIC/UNBRANDED [Amazon.com] SONY Xperia C5 Ultra [E5506]
Short:
I need to update from 5.0 to 5.1 but can't seem to via OTA/Sony PCC despite being able to previously. Is there a way to do this, and preferably, not lose my data [as when I updated from 5.0 to 5.1 before with Sony PCC]
Long:
Initially I had no problems updating my phone using Sony PC Companion to 5.1.1, but I also had no root access at the time and didn't know of any exploits/etc to gain root that were available.
I ended up on 5.1.1 and after some time used KINGROOT to root followed by SUPER-SUME Pro to try and switch root management software from the sketchy KINGROOT to SuperSU by chainfire.
SUPER-SUME Pro failed on step 2 of 2, and afterwards I had severe problems with my SD card applications and random phone restarts and "Optimizing apps... 1 of 246" Before this however 5.1.1 was working great.
I tried to factory reset but I didn't know about Xperia's anti theft protection and it had an error on 5.1.1 where upon trying to un-lock the phone from the Xperia website or device itself would fail.
On the device it would display "Xperia Care has crashed." when trying to authenticate the user.
I read that this was a common issue with C4/C5 devices running 5.1.1 and that many foreign users were having to ship their phone to USA Texas repair centers.
Instead of this I read and followed a guide on using XperiFirm+FlashTool to flash the original 5.0 back to the device. After this the phone was still in Xperia LOCKDOWN mode, but Xperia Care didn't crash and I was able to update my phone using my google account login.
The firmware I flashed was
Code:
Device: Xperia C5 Ultra (E5506)
CDA: 1299-5697
Market: USA
Operator: Customized US
Network: GENERIC
Release: 29.0.A.1.55 / R1A
Size: 1.31 GB
The problem I'm now having is that neither my phone via OTA, Sony PC Companion, or XperiFirm seem to have an R1A US update available from 29.0.A.1.55 / R1A [Android 5.0] to 29.1.A.0.87 / R1A [Android 5.1.1]
They all report that my 5.0 install is the latest version, and via the XperiFirm tool there is no other firmware listed other than the 29.0.A.1.55 / R1A [Android 5.0]
At this point I don't care about root so much as just being able to get back to 5.1.1 from 5.0.
Is there any assistance that anyone can provide? I have tried to find a 5.1.1 firmware to flash but all are other regions. Is there anyway to get Sony PCC to update or find the update OTA? I'm confused as to why the update seems to be missing for the US region when my phone is a US model and had the update before.
I was also hoping there was a way if I do find the firmware that I could flash it w/o losing application/user data, as I already extensively set everything up again.
Thanks again so much for reading and I greatly appreciate any wisdom the XDA-Dev forum has for me.
[I had screenshots of XperiFirm/Phone Info/PCC but I can't have outside links in my post as I'm a new forum member]

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I flashed the Canadian WIND CA 29.1.A.0.87 R3A firmware (as I figured this was the closest thing to a US region firmware if there was differences) via FlashTool and didn't wipe Data and everything seems to be working great so far, back to the improved speed and lower system memory footprint that Lollipop 5.1 offered.

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Hello again,
Does anyone have a copy of the Android 5.1 US Generic CDA 1299-5697 29.1.A.0.87 firmware? I can't find it on xperifirm, and ended up having to flash the WIND CA Canadian branded 5.1 when re-flashing 5.1 on my phone because the xperifirm 5.0 stated no updates available despite my US Generic branded C5 Ultra having previously updated fine through Sony PCC. :/
Having trouble finding it and now it despites my data plan is HSPA+/4G instead of LTE. Any ideas?

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Wind in Canada is a 3G only carrier, and they don't enable LTE in their firmware.

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How would I go about flashing a firmware that has LTE enabled if I can't find the US Generic firmware on xperifirm? Is there another 5.1 fw that would be safe?

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Darkshades said:
How would I go about flashing a firmware that has LTE enabled if I can't find the US Generic firmware on xperifirm? Is there another 5.1 fw that would be safe?
Click to expand...
Click to collapse
In a rush so this will be short.
1. Flash back to stock US 5.0 full .tft
2. Next flash any 5.1 tft using only system.sin and boot.sin re-read/see my #1 post in the Flashtool thread for instruction. :good:
NOTE to ALL:
STOP FLASHING THE ENTIRE .TFT's THERE IS NO NEED UNLESS YOU HAVE A BRICK :laugh:

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Thank you so much for your quick response;
I did this [Flashed US stock 5.0, then just the system/boot from 5.1] and instead of displaying "4G" at the top when connected to data it now displays "H+"; is this AT&T LTE? I tried googling a bunch of information but got a lot of different answers.
I feel like when I was originally on the US 5.0>5.1 that Sony PCC installed [before the root incident/flash back to 5.0>Wind 5.1] that it said LTE at the top but maybe I just imagined it? Thanks again so much for taking time out of your day to help me, it's greatly appreciated. _(._.)_
EDIT: Just downloaded LTE On Off from the google play store and set the preferred network to LTE and it's showing LTE connection now, I did a speed test using speedof.me/m/, is 10 Mbps down / 2.7 Mbps up sound accurate for LTE?

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Darkshades said:
Thank you so much for your quick response;
I did this [Flashed US stock 5.0, then just the system/boot from 5.1] and instead of displaying "4G" at the top when connected to data it now displays "H+"; is this AT&T LTE? I tried googling a bunch of information but got a lot of different answers.
I feel like when I was originally on the US 5.0>5.1 that Sony PCC installed [before the root incident/flash back to 5.0>Wind 5.1] that it said LTE at the top but maybe I just imagined it? Thanks again so much for taking time out of your day to help me, it's greatly appreciated. _(._.)_
EDIT: Just downloaded LTE On Off from the google play store and set the preferred network to LTE and it's showing LTE connection now, I did a speed test using speedof.me/m/, is 10 Mbps down / 2.7 Mbps up sound accurate for LTE?
Click to expand...
Click to collapse
I am not too sure about the US "LTE" or what all the bands mean in the US as they are very confusing
From my memory I seem to recall someone explaining about how at&t use a combo two 2/3G bands and call it LTE (4G) band ???? and 1700 I think
Sorry I can't be more helpful but you may get some better info from a US user. :fingers-crossed:

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US version 5.1 is available now.

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mingkee said:
US version 5.1 is available now.
Click to expand...
Click to collapse
need link for any 5.1 firmware, no matter if US, canada or LA, since I need to downgrade one to try removing XTP.
thanks