Opencore 6.3+Big Sur := Gray Screen on Acer Predator Helios 300

I am using OpenCore 6.3 with Success' href='/2020/12/install-macos-catalina-on-supported-pc.html'>Catalina. It's looking fine except wifi. So I want to upgrade Success' href='/2020/12/install-macos-catalina-on-supported-pc.html'>Catalina to Big Sur. With same config.plist, the Big Sur gave me a grey screen with a mouse cursor.

Hardware:

Acer Predator Helios 300 Laptop

Intel i7-8750H, 32GB Ram

Nvidia 1060Ti-6GB, but I am using UHD 630 on Success' href='/2020/12/install-macos-catalina-on-supported-pc.html'>Catalina.

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End of log is:

94:127 00:238 AAPL: #[EB.BST.FBS|RHPSZ] 229

94:358 00:230 AAPL: #[EB.BST.FBS|RHMSZ] 3626

94:730 00:372 OCSMC: SmcReadValue Key 4D535463 Size 1

94:875 00:145 OCSMC: SmcReadValue Key 4D534163 Size 2

95:106 00:230 AAPL: #[EB.B.WFDW|!WF] Err(0xE) 0

95:342 00:236 AAPL: #[EB|LOG:DT] 2020-11-21T18:11:27

95:587 00:245 AAPL: #[EB|LOG:EXITBS:START] 2020-11-21T18:11:27

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I've tried to unlock CFG but fail. 0x3E has no changed at all.