1. Charge the battery above 50% (or keep the charger plugged in).
   
2. Install Content Manager Assistant (or QCMA) on your PC.
   
3. Download the firmware you need and rename the file to exactly PSP2UPDAT.PUP.
   
4. In your Content Manager folder, create a folder named UPDATE (all caps) inside the PS Vita folder and put the file there.
   
5. Default path on Windows: Documents\PS Vita\UPDATE\PSP2UPDAT.PUP
   
6. Connect the Vita to your PC with a USB cable, then go to Settings → System Update → Update by Connecting to a PC, or boot into Safe Mode (hold R + PS + Power) and choose Update System Software → Update by Connecting to a PC.
   

Quote:⚠ Important Notes

• Official firmware cannot be downgraded. The system updater only installs a version equal to or higher than what is currently on your Vita.
  
• Homebrew / HENkaku users: do NOT update past the firmware your hack supports. Once you go up, there is no going back with the official updater.
  
• Never turn off the Vita or disconnect the cable during an update. An interrupted update can brick the system.
  
• DevKit firmware is for development kits only. Do NOT try to install it on a retail PS Vita or PS TV.
  
• Always verify the MD5 hash after downloading to make sure the file is complete and unmodified.
  

• PS Vita Firmware 3.74 [NEW]  |  127.63 MB  |  MD5: F2C7B12FE85496EC88A0391B514D6E3B
  
• PS Vita Firmware 3.73  |  127.57 MB  |  MD5: 034AB948BBF1A002E0A058C602184B32
  
• PS Vita Firmware 3.72  |  127.57 MB  |  MD5: 84A422F3AE0671DE01E0F56D8DE88A36
  
• PS Vita Firmware 3.71  |  127.57 MB  |  MD5: 46B79772448291194608B44B17235DA2
  
• PS Vita Firmware 3.70  |  127.57 MB  |  MD5: 54227FD645FCB6F177102CBD1F2D1924
  
• PS Vita Firmware 3.69  |  127.58 MB  |  MD5: 03448696E4E7F31E47C60F9B77FE632A
  
• PS Vita Firmware 3.68  |  127.56 MB  |  MD5: FDC6F6BB6EED9FD82F7C4BC7414EAF4C
  
• PS Vita Firmware 3.67  |  127.55 MB  |  MD5: 0ACE865229EC4C3F6FDF310EE083B11E
  
• PS Vita Firmware 3.65  |  127.56 MB  |  MD5: 0A0F2A9AE58968AC5D1D2127049C3CBA
  
• PS Vita Firmware 3.63  |  127.49 MB  |  MD5: 43FA84109F0EF773D7C0553387B55B50
  
• PS Vita Firmware 3.61  |  127.48 MB  |  MD5: 99D9AB3E57A677B38E42CC6409B95E3B
  
• PS Vita Firmware 3.60  |  127.48 MB  |  MD5: CD80B3DA55771C99557DB552542DFF2B
  
• PS Vita Firmware 3.57  |  126.55 MB  |  MD5: 6C0E5DD66F5BA1E517B4311E471360D0
  
• PS Vita Firmware 3.55  |  126.56 MB  |  MD5: 5759C9DF04450E1DD6A0C3D18C8A4E82
  
• PS Vita Firmware 3.52  |  126.53 MB  |  MD5: 3139FC516EE1B1C285A6DD7AA23CDFE2
  
• PS Vita Firmware 3.51  |  126.53 MB  |  MD5: C74D838AF1FBA48B97AAE4CD9A5BC395
  
• PS Vita Firmware 3.50  |  126.54 MB  |  MD5: 27140A86D3934CA83AD0B8401294083C
  
• PS Vita Firmware 3.36  |  123.68 MB  |  MD5: C85FEFB7957CAAA1CBA9E69474ABEA97
  
• PS Vita Firmware 3.35  |  123.67 MB  |  MD5: 0CB2594E90A2677E3AB1AEF19B928617
  
• PS Vita Firmware 3.30  |  123.11 MB  |  MD5: 5B9886F1343880087101D11215D2C3C3
  
• PS Vita Firmware 3.18  |  115.76 MB  |  MD5: 977F3EB1E691FFC4D5E7B47A2A21BEAB
  
• PS Vita Firmware 3.15  |  115.74 MB  |  MD5: 1632804C073DF1E73719FBECB790E03F
  
• PS Vita Firmware 3.12  |  114.23 MB  |  MD5: 369CCE536878CF976C4B1E673418096F
  
• PS Vita Firmware 3.10  |  114.25 MB  |  MD5: C0ACC19376FEB14D4DC100CA3A7F82D7
  
• PS Vita Firmware 3.01  |  125.67 MB  |  MD5: 329C1D98CBB2F6CC445EBFEA9BE9496C
  
• PS Vita Firmware 3.00  |  125.66 MB  |  MD5: 7C51F205AF547164005243AC21FC4C33
  

• PS Vita Firmware 2.61  |  117.92 MB  |  MD5: 31D4EC0473C6E84EA63FD8C428A9855C
  
• PS Vita Firmware 2.60  |  117.94 MB  |  MD5: 749AAE5FE7D6162F59A450939D859EE0
  
• PS Vita Firmware 2.12  |  113.51 MB  |  MD5: 6747CF9CAFE4C8F804193C7C37349869
  
• PS Vita Firmware 2.11  |  113.51 MB  |  MD5: 1131CB560FE583E26BE90770857B5C18
  
• PS Vita Firmware 2.10  |  113.54 MB  |  MD5: 03A8767820CD3D4384AE7636648E8740
  
• PS Vita Firmware 2.06  |  109.88 MB  |  MD5: 10F90FE07B9B416FD70DAB006A97FD8F
  
• PS Vita Firmware 2.05  |  109.88 MB  |  MD5: DB28AE7D77DBA9D2C31431AA08E991AE
  
• PS Vita Firmware 2.02  |  109.84 MB  |  MD5: 5AE40582F6BBD582BAE91EDCF2DB982A
  
• PS Vita Firmware 2.01  |  109.84 MB  |  MD5: 0625BF047254AB121417FEBD1A7BFBD4
  
• PS Vita Firmware 2.00  |  109.86 MB  |  MD5: FAB2DB211065450E8091EE506B067973
  

• PS Vita Firmware 1.81  |  101.96 MB  |  MD5: 3C564C2241988C52F99A31668D59FAF0
  
• PS Vita Firmware 1.80  |  101.98 MB  |  MD5: F76673AF255D5A6E183EAE5DD1AE05B5
  
• PS Vita Firmware 1.69.1  |  96.16 MB  |  MD5: 6075C28175518A84EB47DE7E84B30EB2
  
• PS Vita Firmware 1.69.0  |  96.16 MB  |  MD5: C3A1589E8D029A72879F35D218C8D618
  
• PS Vita Firmware 1.67  |  96.16 MB  |  MD5: B872A4783A0DE272A3BEF6BA2B2B1ED9
  
• PS Vita Firmware 1.66  |  96.16 MB  |  MD5: FB68D6099EAB0BA188FD92EBFF5085A2
  
• PS Vita Firmware 1.65  |  96.16 MB  |  MD5: 03A1888A00A58ACD2316CBEC309716A9
  
• PS Vita Firmware 1.61  |  94.08 MB  |  MD5: F0BC997C94A6190768515C7D1F6DB7B3
  
• PS Vita Firmware 1.60  |  94.08 MB  |  MD5: 5E9C9BC4F434DB1401D30EC41C174AB9
  
• PS Vita Firmware 1.52  |  90.26 MB  |  MD5: 01A72DE4DD90191F679F648DA8D11A48
  
• PS Vita Firmware 1.51  |  90.12 MB  |  MD5: 48AC631ECAE3837A7530506DE0D73EAF
  
• PS Vita Firmware 1.50  |  90.12 MB  |  MD5: F090A69BCF392B5C311B9E786C5CC0B5
  

• DevKit Firmware 1.030.071  |  204.98 MB  |  MD5: 0413CB9BA20C6CC9C3497AC5B6C6F6BC
  
• DevKit Firmware 1.000.041  |  196.02 MB  |  MD5: 38BAD67B5E259837B07E68E047790D47
  
• DevKit Firmware 1.000.071  |  195.85 MB  |  MD5: 9141EAAD8456F36CCF4E0610996A0CA3
  
• DevKit Firmware 0.996.070  |  219.1 MB  |  MD5: 08DB7A1C02EA11D0D1310A0281150C94
  
• DevKit Firmware 0.996.090  |  219.1 MB  |  MD5: 9E6A87EF710A4079D67680BB308D1F14
  
• DevKit Firmware 0.945.040  |  148.29 MB  |  MD5: 64D8EE1BCD3FB6B28A88A81A1EFF843D