Quick updates for this thread: I had a two hour call with the Dell technician to see if the TPM loss problem could be resolved. (Based on my prompt and the technician's guidance) I even tried opening up the laptop, removing the battery, removing the memory sticks, pressing the power button for 30 seconds (to drain charge) and putting everything back again. This did not help either. Meanwhile I came to know that Dell has rolled back the availability of its BIOS version to 1.7.1 (the newest one it had released was 1.8.1, now the latest one available on Dell site is 1.7.1). So there seems to be a major flaw in the BIOS versions after 1.7.1 In any case after 2 hours of trying various things, the technician gave up and suggested a motherboard replacement. The laptop was bought in October 2017 and is the top of the line version (1TB SSD,...). It is appalling to see that a EUR 2600 machine would need a motherboard replacement within a few months of buying.