Problem MiKTeX 21.1 and TexStudio 3.0.4 - "Sorry, but pdflatex.exe did not succeed." error

I have some issues after the latest MiKTeX (v. 21.1) and TexStudio (v. 3.0.4) since yesterday afternoon. I am trying to compile my document using pdflatex, but I always receive this error message:
"Sorry, but pdflatex.exe did not succeed. The log file hopefully contains the information to get MiKTeX going again: … Process exited with error(s)"
The latest messages in the pdflatex log file report as follow:

2021-01-24 12:28:31,726+0100 FATAL pdflatex.core - Data: fileName="pdflatex.fmt"
2021-01-24 12:28:31,726+0100 FATAL pdflatex.core - Source: LibrariesMiKTeXTeXAndFriendstexmfapp.cpp:717
2021-01-24 12:28:31,726+0100 FATAL pdflatex - The memory dump file could not be found.
2021-01-24 12:28:31,726+0100 FATAL pdflatex - Info: fileName="pdflatex.fmt"
2021-01-24 12:28:31,726+0100 FATAL pdflatex - Source: LibrariesMiKTeXTeXAndFriendstexmfapp.cpp
2021-01-24 12:28:31,726+0100 FATAL pdflatex - Line: 717
2021-01-24 12:28:31,726+0100 INFO  pdflatex - this process (948) finishes with exit code 1

I actually don’t know what these errors mean, and in particular this kind of problem appeared after I have run the Update check from the MiKTeX console. Therefore I believe it is somehow related.

Thanks a lot for your support.

EDIT
Her the full pdflatex log file stored in the makefmt folder:

This is pdfTeX, Version 3.14159265-2.6-1.40.21 (MiKTeX 21.1) (INITEX)  24 JAN 2021 16:38
entering extended mode
**.../AppData/Local/Programs/MiKTeX/tex/latex/00miktex/pdflatex.in
i

(...AppData/Local/Programs/MiKTeX/tex/latex/00miktex/pdflatex.ini
(...AppDataRoamingMiKTeXtex/generic/configpdftexconfig.tex)
(...AppDataLocalProgramsMiKTeXtex/latex/baselatex.ltx
(...AppDataLocalProgramsMiKTeXtex/latex/basetexsys.cfg)
openout15 = `texsys.aux'.


./texsys.aux found


@currdir set to: ./.


Assuming openin and input 
have the same search path.


Defining UNIX/DOS style filename parser.

catcodes, registers,
maxdimen=dimen10
hideskip=skip10
p@=dimen11
z@=dimen12
z@skip=skip11
voidb@x=box10
 parameters,
normalbaselineskip=skip12
normallineskip=skip13
normallineskiplimit=dimen13
interfootnotelinepenalty=count23
strutbox=box11

LaTeX2e <2020-10-01> patch level 4
(...AppDataLocalProgramsMiKTeXtex/latex/l3kernelexpl3.ltx
(...AppDataLocalProgramsMiKTeXtex/latex/l3kernelexpl3-code.t
ex
Package: expl3 2021-01-09 L3 programming layer (code)
c_max_int=count24
l_tmpa_int=count25
l_tmpb_int=count26
g_tmpa_int=count27
g_tmpb_int=count28
l__seq_internal_a_int=count29
l__seq_internal_b_int=count30
g__kernel_prg_map_int=count31
c__ior_term_noprompt_ior=count32
c_log_iow=count33
l_iow_line_count_int=count34
l__iow_line_target_int=count35
l__iow_one_indent_int=count36
l__iow_indent_int=count37
c_zero_dim=dimen14
c_max_dim=dimen15
l_tmpa_dim=dimen16
l_tmpb_dim=dimen17
g_tmpa_dim=dimen18
g_tmpb_dim=dimen19
c_zero_skip=skip14
c_max_skip=skip15
l_tmpa_skip=skip16
l_tmpb_skip=skip17
g_tmpa_skip=skip18
g_tmpb_skip=skip19
c_zero_muskip=muskip10
c_max_muskip=muskip11
l_tmpa_muskip=muskip12
l_tmpb_muskip=muskip13
g_tmpa_muskip=muskip14
g_tmpb_muskip=muskip15
l_keys_choice_int=count38
l__intarray_loop_int=count39
c__intarray_sp_dim=dimen20
g__intarray_font_int=count40
c__fp_leading_shift_int=count41
c__fp_middle_shift_int=count42
c__fp_trailing_shift_int=count43
c__fp_big_leading_shift_int=count44
c__fp_big_middle_shift_int=count45
c__fp_big_trailing_shift_int=count46
c__fp_Bigg_leading_shift_int=count47
c__fp_Bigg_middle_shift_int=count48
c__fp_Bigg_trailing_shift_int=count49
c__kernel_randint_max_int=count50
g__fp_array_int=count51
l__fp_array_loop_int=count52
g__cctab_allocate_int=count53
l__sort_length_int=count54
l__sort_min_int=count55
l__sort_top_int=count56
l__sort_max_int=count57
l__sort_true_max_int=count58
l__sort_block_int=count59
l__sort_begin_int=count60
l__sort_end_int=count61
l__sort_A_int=count62
l__sort_B_int=count63
l__sort_C_int=count64
c__str_replacement_char_int=count65
l__str_modulo_int=count66
l__tl_analysis_normal_int=count67
l__tl_analysis_index_int=count68
l__tl_analysis_nesting_int=count69
l__tl_analysis_type_int=count70
l__tl_peek_charcode_int=count71
l__regex_internal_a_int=count72
l__regex_internal_b_int=count73
l__regex_internal_c_int=count74
l__regex_balance_int=count75
l__regex_group_level_int=count76
l__regex_mode_int=count77
c__regex_cs_in_class_mode_int=count78
c__regex_cs_mode_int=count79
l__regex_catcodes_int=count80
l__regex_default_catcodes_int=count81
c__regex_catcode_D_int=count82
c__regex_catcode_S_int=count83
c__regex_catcode_L_int=count84
c__regex_catcode_O_int=count85
c__regex_catcode_A_int=count86
c__regex_all_catcodes_int=count87
l__regex_show_lines_int=count88
l__regex_min_state_int=count89
l__regex_max_state_int=count90
l__regex_left_state_int=count91
l__regex_right_state_int=count92
l__regex_capturing_group_int=count93
l__regex_min_pos_int=count94
l__regex_max_pos_int=count95
l__regex_curr_pos_int=count96
l__regex_start_pos_int=count97
l__regex_success_pos_int=count98
l__regex_curr_char_int=count99
l__regex_curr_catcode_int=count100
l__regex_last_char_int=count101
l__regex_last_char_success_int=count102
l__regex_case_changed_char_int=count103
l__regex_curr_state_int=count104
l__regex_step_int=count105
l__regex_min_thread_int=count106
l__regex_max_thread_int=count107
l__regex_replacement_csnames_int=count108
l__regex_match_count_int=count109
l__regex_min_submatch_int=count110
l__regex_submatch_int=count111
l__regex_zeroth_submatch_int=count112
g__regex_trace_regex_int=count113
c_empty_box=box12
l_tmpa_box=box13
l_tmpb_box=box14
g_tmpa_box=box15
g_tmpb_box=box16
l__box_top_dim=dimen21
l__box_bottom_dim=dimen22
l__box_left_dim=dimen23
l__box_right_dim=dimen24
l__box_top_new_dim=dimen25
l__box_bottom_new_dim=dimen26
l__box_left_new_dim=dimen27
l__box_right_new_dim=dimen28
l__box_internal_box=box17
l__coffin_internal_box=box18
l__coffin_internal_dim=dimen29
l__coffin_offset_x_dim=dimen30
l__coffin_offset_y_dim=dimen31
l__coffin_x_dim=dimen32
l__coffin_y_dim=dimen33
l__coffin_x_prime_dim=dimen34
l__coffin_y_prime_dim=dimen35
c_empty_coffin=box19
l__coffin_aligned_coffin=box20
l__coffin_aligned_internal_coffin=box21
l_tmpa_coffin=box22
l_tmpb_coffin=box23
g_tmpa_coffin=box24
g_tmpb_coffin=box25
l__coffin_bounding_shift_dim=dimen36
l__coffin_left_corner_dim=dimen37
l__coffin_right_corner_dim=dimen38
l__coffin_bottom_corner_dim=dimen39
l__coffin_top_corner_dim=dimen40
l__coffin_scaled_total_height_dim=dimen41
l__coffin_scaled_width_dim=dimen42
c__coffin_empty_coffin=box26
l__coffin_display_coffin=box27
l__coffin_display_coord_coffin=box28
l__coffin_display_pole_coffin=box29
l__coffin_display_offset_dim=dimen43
l__coffin_display_x_dim=dimen44
l__coffin_display_y_dim=dimen45


! LaTeX3 Error: File 'UnicodeData.txt' not found.

For immediate help type H <return>.
 ...                                              
                                                  
l.28684   }
           
!  ==> Fatal error occurred, no output PDF file produced!