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PS4 Act.dat and PlayStation 4 RIF File Research Findings by IDC
Yesterday we saw his 1.76 PS4 Entrypoint, and today PlayStation 4 developer IDC returns with some PS4 Act.dat and PS4 RIF research documentation stating he will likely add the required code used to restore an act.dat backup to his Github soon as well. 
This news comes following the RIF Samples and PS4 IDX Generator / GenIDX Tool as PlayStation 4 developer @CrazyVoid hinted that both RIF and IDX files are going to be an important part to PS4 game backups and homebrew in the future.
To quote from the Dev Wiki: Act.dat
File Handling
On 1.76, act.dat is loaded and updated by the SceShellCore process.
Beyond 1.76, act.dat is loaded and updated directly by the kernel.
File Verification
A HMACSHA256 of the entire act.dat file using the SHA256 of the OpenPsId as the key is stored in Vtrm using SceShellCore's process ID in slot 0.
SceShellCore's process ID is 0x3800000000000010.
hmacsha256(sha256(sceKernelGetOpenPsIdForSystem()), act.dat) (pseudo-code)
This prevents easily adding or replacing the act.dat file directly. You will need to update this HMAC to prevent the act.dat file from being deleted when adding or replacing it.
File
An act.dat file is made up of 1 to 21 sequential activation structures.
The file is truncated to valid activation structures, so its size will be a multiple of 512.
Activation
Fields are big-endian.
This news comes following the RIF Samples and PS4 IDX Generator / GenIDX Tool as PlayStation 4 developer @CrazyVoid hinted that both RIF and IDX files are going to be an important part to PS4 game backups and homebrew in the future.
To quote from the Dev Wiki: Act.dat
File Handling
On 1.76, act.dat is loaded and updated by the SceShellCore process.
Beyond 1.76, act.dat is loaded and updated directly by the kernel.
File Verification
A HMACSHA256 of the entire act.dat file using the SHA256 of the OpenPsId as the key is stored in Vtrm using SceShellCore's process ID in slot 0.
SceShellCore's process ID is 0x3800000000000010.
hmacsha256(sha256(sceKernelGetOpenPsIdForSystem()), act.dat) (pseudo-code)
- sceSblVtrmStoreNth(0x3800000000000010, hmac, 64, 0)
- sceSblVtrmRetrieveNth(0x3800000000000010, hmac, 64, 0)
- sceSblVtrmFreeNth(0x3800000000000010, 0)
This prevents easily adding or replacing the act.dat file directly. You will need to update this HMAC to prevent the act.dat file from being deleted when adding or replacing it.
File
An act.dat file is made up of 1 to 21 sequential activation structures.
The file is truncated to valid activation structures, so its size will be a multiple of 512.
Activation
Fields are big-endian.
| Name | Offset | Size | Example | Remark |
| Signature | 0x000 | 4 | 41 43 54 00 ('ACT\0') | - |
| Version | 0x004 | 2 | 00 01 | 1 (current) |
| Type | 0x006 | 2 | 00 02 | ...
PS4GearSystem Emulator: Sega Game Gear / Master System on PS4 5.01
Since his PS4 Debug PKG Installation with FSELF Retail Port and the recent MSX Emulator for PS4 progress, today PlayStation 4 developer m0rph3us1987 (Github) shared a PS4GearSystem Emulator demonstration video running on PS4 OFW 5.01. 
In his Tweet embedded below, he states the following to quote: "Sega GameGear and Master System emulator running on PS4 FW 5.01. Next emulator will be NES."
PS4Gearsystem Emulator running on PS4 FW 5.01
Thanks go out to @ArthurBishop for the news tip in the PSXHAX Shoutbox this afternoon and @Figure03 on Discord! 
In his Tweet embedded below, he states the following to quote: "Sega GameGear and Master System emulator running on PS4 FW 5.01. Next emulator will be NES."
PS4Gearsystem Emulator running on PS4 FW 5.01
GTA V PS4 Natives Port for PlayStation 4 v1.76 by John Valincius
Following the previous updates, confirmations, PS4 GTA V Native Caller and handy Pastebin for Grand Theft Auto modders recently John Valincius ported @kurt2467's GTA5 PS3 Native Invoker for PS4 1.76 console owners. 
Download: GTA_PS4_Natives-master.zip / GIT
From the README.md, to quote: GTA_PS4_Natives
This is an edit/updated version of Kurt2467's GTA5 PS3 Native Invoker (https://github.com/kurt2467/GTAV_Native_Invoker)
Requirements
Function loop is our entry point, this will be called whenever IS_PLAYER_ONLINE is called.
Bugs
The source contains a sample menu base with a couple of options. Spawn vehicle is a little bugged as the car spawns under the map, I don't have much time to fix it though.
Use optimization where possible as we do not have a lot of executable memory with this method.
I haven't exactly tested this in a while so let me know whether it's working or not.
I made something (a while ago but release now). Just a port of Kurt2467's GTA_Native_Invoker from PS3. Includes a menu base with minimal features (for reference) as well as all natives...
Download: GTA_PS4_Natives-master.zip / GIT
From the README.md, to quote: GTA_PS4_Natives
This is an edit/updated version of Kurt2467's GTA5 PS3 Native Invoker (https://github.com/kurt2467/GTAV_Native_Invoker)
Requirements
- 1.76 PS4
- Send the included loader payload (loader/loader.bin) to your PS4, you should then get a notification
- Build your payload
- Rename to plugin1.bin
- Copy to USB
- Plug USB into right USB port on the PS4 (usb0)
- Start game and you should get a message saying payload was loaded
Function loop is our entry point, this will be called whenever IS_PLAYER_ONLINE is called.
Bugs
- Sometimes the loader payload will crash, I will fix this if enough people complain about it
The source contains a sample menu base with a couple of options. Spawn vehicle is a little bugged as the car spawns under the map, I don't have much time to fix it though.
Use optimization where possible as we do not have a lot of executable memory with this method.
I haven't exactly tested this in a while so let me know whether it's working or not.
I made something (a while ago but release now). Just a port of Kurt2467's GTA_Native_Invoker from PS3. Includes a menu base with minimal features (for reference) as well as all natives...
GTA V Firebreather Mod PC to PS4 1.76 Port by 0x199 Released
We've seen PS4 Azura GTAV Mod Menus, Far Cry 4 PS4 Mod Menus followed by a PS4 Packer / GTA V Save Editor and now PlayStation 4 developer @0x199 made available a GTA V Firebreather Mod PC to PS4 1.76 port for those with jailbroken consoles to enjoy!
From his Tweets below, to quote: Will soon release a small but fun GTAV mod which was originally created for PC but ported to PS4 1.76.
So the mod I've ported is one of the first PC mods, the Firebreather mod. Will be released to ya'll on 1.76 in an hour.
Here's the Firebreather mod port! Originally developed by Kokolaty for PC. Many thanks to @2much4u and @seb5594 for their assistance! Visit https://sce.party/ps4/modbox/ on your 1.76 PS4 to load the mod.
GTA 5 PC - FIREBREATER MOD DEMO
GTA V P$4 (FIREBREATER MOD)
PS4 1.76 Mod - GTA V Firebreather Port
From his Tweets below, to quote: Will soon release a small but fun GTAV mod which was originally created for PC but ported to PS4 1.76.
So the mod I've ported is one of the first PC mods, the Firebreather mod. Will be released to ya'll on 1.76 in an hour.
Here's the Firebreather mod port! Originally developed by Kokolaty for PC. Many thanks to @2much4u and @seb5594 for their assistance! Visit https://sce.party/ps4/modbox/ on your 1.76 PS4 to load the mod.
GTA 5 PC - FIREBREATER MOD DEMO
GTA V P$4 (FIREBREATER MOD)
PS4 1.76 Mod - GTA V Firebreather Port
PS4 Debug Settings in v1.01 & Toggle_QA.PKG, PS4 QA Flag Enabler Payload (WIP)
Following their PS4 NMount Payload and his help in both the CE-32875-5_Fix.bin and EapDev, PlayStation 4 developer VVildCard777 via zecoxao shared a video on Jose Coixao's YouTube Channel spotlighting Wildcard's Debug Settings in PS4 1.01 OFW.
As noted in the YouTube video's comments by @DarkElementPL, at 1:35 a Toggle_QA.PKG MEME makes a quick appearance before jumping to the Add Content Manager's Entitlement Control screen, to which @GrimDoe replies "~PS3~" as fast as it disappears.
From the video's caption, to quote: wildcard debugsettings 101
Debug settings from my friend wildcard in console with 1.01 version. Since 1.01 does not have store mode in it, he cannot patch it so he uses the combo from the wiki instead (that IDC has mentioned on Twitter)
PS4 flag enabler. should in theory enable all qa and utoken flags. for some reason it doesn't work with 9.00, but it likely works on older firmwares. i already sent the source to AlAzif so she can check it for mistakes
Download: ps4-flag_enabler.bin (0.01 MB)
...
As noted in the YouTube video's comments by @DarkElementPL, at 1:35 a Toggle_QA.PKG MEME makes a quick appearance before jumping to the Add Content Manager's Entitlement Control screen, to which @GrimDoe replies "~PS3~" as fast as it disappears.
From the video's caption, to quote: wildcard debugsettings 101
Debug settings from my friend wildcard in console with 1.01 version. Since 1.01 does not have store mode in it, he cannot patch it so he uses the combo from the wiki instead (that IDC has mentioned on Twitter)
PS4 flag enabler. should in theory enable all qa and utoken flags. for some reason it doesn't work with 9.00, but it likely works on older firmwares. i already sent the source to AlAzif so she can check it for mistakes
Download: ps4-flag_enabler.bin (0.01 MB)
...