Well the latest firmware update 3.50 came out today for the PSVita/PSTV. So you may be wondering what to do if you stayed on frimware 3.36 or lower. Well fear not as Vita update blocker is once again working, so you can access the PlayStation store. Like always, here isn’t much of a time window to use a proxy like vita blocker. 
On another note PlayStation is having a 10% Discount Weekend for PS Store Purchases which starts today. So you are in luck if you want to make a few purchases. So you don’t have much time to get in and out, before PlayStation blocks this trick once again.. Quick note: This only work for FW 3.36 and doesn’t work on fw 3.18.
Download: Vitaupdateblocker V1.2
VITA UPDATE BLOCKER:
This application does what Charles Proxy Trick does but without hassle.
Also this is Python based cross-platform application so you can even install this application to 24/7 running server to access PSN anyhwere.
FEATURES
Automatically detects latest OFW version and Vita’s version.
Can block other requests than update information for prevent server is being used as normal HTTP proxy server.
PORTABLE VERSION
You can get portable executable for Windows here
INSTRUCTIONS
Start vita_update_blocker.exe (or python vita_update_blocker.py)
Open Settings app on your Vita, Go to Network-Wi-Fi Setting-AP Name-Advances Settings.
Change proxy settings to ip:port that shown on VitaUpdateBlocker.
Save settings and open PS Store application.
You’ll see front page of store, go Settings app again and disable proxy.
Download contents from store, play games online or connect to your PS3 via wifi.
OPTIONS
–port <PORT>: customize port, default is 127.0.0.1.
–block-traffics: blocks all traffics except for update information. This will be useful if you’re going to make public server.
REQUIREMENTS
To use VitaUpdateBlocker you need these requirements(portable version users can ignore this)
Python 2.7.6 (Python 3 is not supported due to compatibility with mitmproxy)
mitmproxy
Source: github.com