[HELP] How to downgrade P40 offline without SD-Card / USB drive? - Huawei P40 Pro Questions & Answers

Hello,
I have the update_full_base.zip file on my PC, but unfortunately I don't have a SD-Card or USB drive, nor Internet access (I have a hotel WiFi, but it would take about 30 hours to download via Proxy).
I have the data/charging cable and I can connect it to my PC.
Can you please let me know if there's any way to flash this ROM without internet connection?
Thank you!

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